Java奇葩笔试题

最新推荐文章于 2022-03-17 23:31:12 发布

转载最新推荐文章于 2022-03-17 23:31:12 发布 · 351 阅读

<div id="article_content" class="article_content">

<div class="blog-title clearfix" style="margin:10px 0px 0px; padding:0px; font-family:微软雅黑,Arial,Helvetica,sans-serif; word-wrap:break-word; word-break:break-all; color:rgb(51,51,51); font-size:14px">
<h2 class="show-title" style="margin:0px; line-height:40px; font-size:22px; padding:0px; word-wrap:break-word; word-break:break-all">
1、下面代码中，在if处填写什么代码，可以使得输出结果为：AB</h2>
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<div class="blog-content clearfix" style="margin:0px; padding:10px 0px 4px; font-family:宋体,Arial,Helvetica,sans-serif; word-wrap:break-word; word-break:break-all; font-size:14px; vertical-align:baseline; line-height:28px; color:rgb(51,51,51)">
<div class="desc rich-content" style="margin:0px; padding:1px 0px 0px; font-family:微软雅黑,Arial,Helvetica,sans-serif; word-wrap:break-word; word-break:break-all">
<div class="markdown" style="margin:0px 10px; padding:0px; word-wrap:break-word; word-break:break-all">
<table class="highlighttable " style="max-width:100%; background-color:transparent; border-collapse:collapse; border-spacing:0px; word-wrap:break-word; word-break:break-all; width:910px; overflow-x:auto; margin:0px 0px 10px; padding:0px; border:1px solid rgb(204,204,204); display:block; overflow-y:hidden">
<tbody>
<tr style="word-wrap:break-word; word-break:break-all">
<td class="linenos" style="word-wrap:break-word; word-break:break-all; width:25px; text-align:right; border-right-width:1px; border-right-style:solid; border-right-color:rgb(204,204,204); background-color:rgb(245,245,245)">
<div class="linenodiv" style="margin:0px; padding:0px; font-family:微软雅黑,Arial,Helvetica,sans-serif; word-wrap:break-word; word-break:break-all">
<pre style="padding:0px 8px 0px 0px; font-family:Monaco,Menlo,Consolas,'Courier New',monospace; font-size:13px; color:rgb(51,51,51); margin-top:0px; margin-bottom:0px; line-height:20px; word-break:break-all; word-wrap:break-word; border:none; width:30px">1
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9</pre>
</div>
</td>
<td class="code" style="word-wrap:break-word; word-break:break-all">
<div class="highlight" style="margin:0px; padding:0px; font-family:微软雅黑,Arial,Helvetica,sans-serif; word-wrap:break-word; word-break:break-all">
<pre style="padding:9.5px; font-family:Monaco,Menlo,Consolas,'Courier New',monospace; font-size:13px; color:rgb(51,51,51); margin-top:0px; margin-bottom:-1px; line-height:20px; word-break:break-all; word-wrap:break-word; background-color:white; border:none">public static void main(String[] args) {

if ( ){//填写条件
System.out.print("A");
} else {
System.out.print("B");
}
}
}
</pre>
</div>
</td>
</tr>
</tbody>
</table>

2、运算符问题，下面代码分别输出什么？
<table class="highlighttable " style="max-width:100%; background-color:transparent; border-collapse:collapse; border-spacing:0px; word-wrap:break-word; word-break:break-all; width:910px; overflow-x:auto; margin:0px 0px 10px; padding:0px; border:1px solid rgb(204,204,204); display:block; overflow-y:hidden">
<tbody>
<tr style="word-wrap:break-word; word-break:break-all">
<td class="linenos" style="word-wrap:break-word; word-break:break-all; width:25px; text-align:right; border-right-width:1px; border-right-style:solid; border-right-color:rgb(204,204,204); background-color:rgb(245,245,245)">
<div class="linenodiv" style="margin:0px; padding:0px; font-family:微软雅黑,Arial,Helvetica,sans-serif; word-wrap:break-word; word-break:break-all">
<pre style="padding:0px 8px 0px 0px; font-family:Monaco,Menlo,Consolas,'Courier New',monospace; font-size:13px; color:rgb(51,51,51); margin-top:0px; margin-bottom:0px; line-height:20px; word-break:break-all; word-wrap:break-word; border:none; width:30px"> 1
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10</pre>
</div>
</td>
<td class="code" style="word-wrap:break-word; word-break:break-all">
<div class="highlight" style="margin:0px; padding:0px; font-family:微软雅黑,Arial,Helvetica,sans-serif; word-wrap:break-word; word-break:break-all">
<pre style="padding:9.5px; font-family:Monaco,Menlo,Consolas,'Courier New',monospace; font-size:13px; color:rgb(51,51,51); margin-top:0px; margin-bottom:-1px; line-height:20px; word-break:break-all; word-wrap:break-word; background-color:white; border:none">package test;
public class Test {
public static void main(String[] args) {
int i1 = 10, i2 = 10;
System.err.println("i1 + i2 = " + i1 + i2);
System.err.println("i1 - i2 = " + i1 - i2);
System.err.println("i1 * i2 = " + i1 * i2);
System.err.println("i1 / i2 = " + i1 / i2);
}
}
</pre>
</div>
</td>
</tr>
</tbody>
</table>

3、下面代码的结果是什么？还是抛出异常？
<table class="highlighttable " style="max-width:100%; background-color:transparent; border-collapse:collapse; border-spacing:0px; word-wrap:break-word; word-break:break-all; width:910px; overflow-x:auto; margin:0px 0px 10px; padding:0px; border:1px solid rgb(204,204,204); display:block; overflow-y:hidden">
<tbody>
<tr style="word-wrap:break-word; word-break:break-all">
<td class="linenos" style="word-wrap:break-word; word-break:break-all; width:25px; text-align:right; border-right-width:1px; border-right-style:solid; border-right-color:rgb(204,204,204); background-color:rgb(245,245,245)">
<div class="linenodiv" style="margin:0px; padding:0px; font-family:微软雅黑,Arial,Helvetica,sans-serif; word-wrap:break-word; word-break:break-all">
<pre style="padding:0px 8px 0px 0px; font-family:Monaco,Menlo,Consolas,'Courier New',monospace; font-size:13px; color:rgb(51,51,51); margin-top:0px; margin-bottom:0px; line-height:20px; word-break:break-all; word-wrap:break-word; border:none; width:30px"> 1
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</div>
</td>
<td class="code" style="word-wrap:break-word; word-break:break-all">
<div class="highlight" style="margin:0px; padding:0px; font-family:微软雅黑,Arial,Helvetica,sans-serif; word-wrap:break-word; word-break:break-all">
<pre style="padding:9.5px; font-family:Monaco,Menlo,Consolas,'Courier New',monospace; font-size:13px; color:rgb(51,51,51); margin-top:0px; margin-bottom:-1px; line-height:20px; word-break:break-all; word-wrap:break-word; background-color:white; border:none">package test;

public class Test {

public void myMethod(String str) {
System.err.println("string");
}

public void myMethod(Object obj) {
System.err.println("object");
}

public static void main(String[] args) {
Test t = new Test();
t.myMethod(null);
}
}
</pre>
</div>
</td>
</tr>
</tbody>
</table>

4、下面代码的输出结果是什么？
<table class="highlighttable " style="max-width:100%; background-color:transparent; border-collapse:collapse; border-spacing:0px; word-wrap:break-word; word-break:break-all; width:910px; overflow-x:auto; margin:0px 0px 10px; padding:0px; border:1px solid rgb(204,204,204); display:block; overflow-y:hidden">
<tbody>
<tr style="word-wrap:break-word; word-break:break-all">
<td class="linenos" style="word-wrap:break-word; word-break:break-all; width:25px; text-align:right; border-right-width:1px; border-right-style:solid; border-right-color:rgb(204,204,204); background-color:rgb(245,245,245)">
<div class="linenodiv" style="margin:0px; padding:0px; font-family:微软雅黑,Arial,Helvetica,sans-serif; word-wrap:break-word; word-break:break-all">
<pre style="padding:0px 8px 0px 0px; font-family:Monaco,Menlo,Consolas,'Courier New',monospace; font-size:13px; color:rgb(51,51,51); margin-top:0px; margin-bottom:0px; line-height:20px; word-break:break-all; word-wrap:break-word; border:none; width:30px"> 1
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11</pre>
</div>
</td>
<td class="code" style="word-wrap:break-word; word-break:break-all">
<div class="highlight" style="margin:0px; padding:0px; font-family:微软雅黑,Arial,Helvetica,sans-serif; word-wrap:break-word; word-break:break-all">
<pre style="padding:9.5px; font-family:Monaco,Menlo,Consolas,'Courier New',monospace; font-size:13px; color:rgb(51,51,51); margin-top:0px; margin-bottom:-1px; line-height:20px; word-break:break-all; word-wrap:break-word; background-color:white; border:none">package test;

public class Test {

public static void main(String[] args) {
double val = 11.5;
System.err.println(Math.round(val));
System.err.println(Math.floor(val));
System.err.println(Math.ceil(val));
}
}
</pre>
</div>
</td>
</tr>
</tbody>
</table>

5、下面代码的结果是什么？
<table class="highlighttable " style="max-width:100%; background-color:transparent; border-collapse:collapse; border-spacing:0px; word-wrap:break-word; word-break:break-all; width:910px; overflow-x:auto; margin:0px 0px 10px; padding:0px; border:1px solid rgb(204,204,204); display:block; overflow-y:hidden">
<tbody>
<tr style="word-wrap:break-word; word-break:break-all">
<td class="linenos" style="word-wrap:break-word; word-break:break-all; width:25px; text-align:right; border-right-width:1px; border-right-style:solid; border-right-color:rgb(204,204,204); background-color:rgb(245,245,245)">
<div class="linenodiv" style="margin:0px; padding:0px; font-family:微软雅黑,Arial,Helvetica,sans-serif; word-wrap:break-word; word-break:break-all">
<pre style="padding:0px 8px 0px 0px; font-family:Monaco,Menlo,Consolas,'Courier New',monospace; font-size:13px; color:rgb(51,51,51); margin-top:0px; margin-bottom:0px; line-height:20px; word-break:break-all; word-wrap:break-word; border:none; width:30px"> 1
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</div>
</td>
<td class="code" style="word-wrap:break-word; word-break:break-all">
<div class="highlight" style="margin:0px; padding:0px; font-family:微软雅黑,Arial,Helvetica,sans-serif; word-wrap:break-word; word-break:break-all">
<pre style="padding:9.5px; font-family:Monaco,Menlo,Consolas,'Courier New',monospace; font-size:13px; color:rgb(51,51,51); margin-top:0px; margin-bottom:-1px; line-height:20px; word-break:break-all; word-wrap:break-word; background-color:white; border:none">package test;

public class Test extends Base {

public static void main(String[] args) {
Base b = new Test();
b.method();

Test t = new Test();
t.method();
}

@Override
public void method() {
System.err.println("test");
}

}

class Base {
public void method() throws InterruptedException {
System.err.println("base");
}
}
</pre>
</div>
</td>
</tr>
</tbody>
</table>

6、以下代码的结果是什么？
<table class="highlighttable " style="max-width:100%; background-color:transparent; border-collapse:collapse; border-spacing:0px; word-wrap:break-word; word-break:break-all; width:910px; overflow-x:auto; margin:0px 0px 10px; padding:0px; border:1px solid rgb(204,204,204); display:block; overflow-y:hidden">
<tbody>
<tr style="word-wrap:break-word; word-break:break-all">
<td class="linenos" style="word-wrap:break-word; word-break:break-all; width:25px; text-align:right; border-right-width:1px; border-right-style:solid; border-right-color:rgb(204,204,204); background-color:rgb(245,245,245)">
<div class="linenodiv" style="margin:0px; padding:0px; font-family:微软雅黑,Arial,Helvetica,sans-serif; word-wrap:break-word; word-break:break-all">
<pre style="padding:0px 8px 0px 0px; font-family:Monaco,Menlo,Consolas,'Courier New',monospace; font-size:13px; color:rgb(51,51,51); margin-top:0px; margin-bottom:0px; line-height:20px; word-break:break-all; word-wrap:break-word; border:none; width:30px"> 1
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</div>
</td>
<td class="code" style="word-wrap:break-word; word-break:break-all">
<div class="highlight" style="margin:0px; padding:0px; font-family:微软雅黑,Arial,Helvetica,sans-serif; word-wrap:break-word; word-break:break-all">
<pre style="padding:9.5px; font-family:Monaco,Menlo,Consolas,'Courier New',monospace; font-size:13px; color:rgb(51,51,51); margin-top:0px; margin-bottom:-1px; line-height:20px; word-break:break-all; word-wrap:break-word; background-color:white; border:none">package test;

public class Test extends Base {

public static void main(String[] args) {
new Test().method();
}

public void method() {
System.err.println(this.getClass().getName());
System.err.println(super.getClass().getName());
System.err.println(this.getClass().getSuperclass().getName());
System.err.println(super.getClass().getSuperclass().getName());
}

}

class Base {
}
</pre>
</div>
</td>
</tr>
</tbody>
</table>

7、true or false？
<table class="highlighttable " style="max-width:100%; background-color:transparent; border-collapse:collapse; border-spacing:0px; word-wrap:break-word; word-break:break-all; width:910px; overflow-x:auto; margin:0px 0px 10px; padding:0px; border:1px solid rgb(204,204,204); display:block; overflow-y:hidden">
<tbody>
<tr style="word-wrap:break-word; word-break:break-all">
<td class="linenos" style="word-wrap:break-word; word-break:break-all; width:25px; text-align:right; border-right-width:1px; border-right-style:solid; border-right-color:rgb(204,204,204); background-color:rgb(245,245,245)">
<div class="linenodiv" style="margin:0px; padding:0px; font-family:微软雅黑,Arial,Helvetica,sans-serif; word-wrap:break-word; word-break:break-all">
<pre style="padding:0px 8px 0px 0px; font-family:Monaco,Menlo,Consolas,'Courier New',monospace; font-size:13px; color:rgb(51,51,51); margin-top:0px; margin-bottom:0px; line-height:20px; word-break:break-all; word-wrap:break-word; border:none; width:30px"> 1
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</div>
</td>
<td class="code" style="word-wrap:break-word; word-break:break-all">
<div class="highlight" style="margin:0px; padding:0px; font-family:微软雅黑,Arial,Helvetica,sans-serif; word-wrap:break-word; word-break:break-all">
<pre style="padding:9.5px; font-family:Monaco,Menlo,Consolas,'Courier New',monospace; font-size:13px; color:rgb(51,51,51); margin-top:0px; margin-bottom:-1px; line-height:20px; word-break:break-all; word-wrap:break-word; background-color:white; border:none">package test;

public class Test {

public static void main(String[] args) {
String str1 = new String("abc");
String str2 = new String("abc");
System.err.println(str1.equals(str2));

StringBuffer sb1 = new StringBuffer("abc");
StringBuffer sb2 = new StringBuffer("abc");
System.err.println(sb1.equals(sb2));
}
}
</pre>
</div>
</td>
</tr>
</tbody>
</table>

8、输出的结果是什么？
<table class="highlighttable " style="max-width:100%; background-color:transparent; border-collapse:collapse; border-spacing:0px; word-wrap:break-word; word-break:break-all; width:910px; overflow-x:auto; margin:0px 0px 10px; padding:0px; border:1px solid rgb(204,204,204); display:block; overflow-y:hidden">
<tbody>
<tr style="word-wrap:break-word; word-break:break-all">
<td class="linenos" style="word-wrap:break-word; word-break:break-all; width:25px; text-align:right; border-right-width:1px; border-right-style:solid; border-right-color:rgb(204,204,204); background-color:rgb(245,245,245)">
<div class="linenodiv" style="margin:0px; padding:0px; font-family:微软雅黑,Arial,Helvetica,sans-serif; word-wrap:break-word; word-break:break-all">
<pre style="padding:0px 8px 0px 0px; font-family:Monaco,Menlo,Consolas,'Courier New',monospace; font-size:13px; color:rgb(51,51,51); margin-top:0px; margin-bottom:0px; line-height:20px; word-break:break-all; word-wrap:break-word; border:none; width:30px"> 1
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</div>
</td>
<td class="code" style="word-wrap:break-word; word-break:break-all">
<div class="highlight" style="margin:0px; padding:0px; font-family:微软雅黑,Arial,Helvetica,sans-serif; word-wrap:break-word; word-break:break-all">
<pre style="padding:9.5px; font-family:Monaco,Menlo,Consolas,'Courier New',monospace; font-size:13px; color:rgb(51,51,51); margin-top:0px; margin-bottom:-1px; line-height:20px; word-break:break-all; word-wrap:break-word; background-color:white; border:none">package test;

public class Test {

public static void main(String[] args) {
System.err.println(new Test().method1());
System.err.println(new Test().method2());
}

public int method1() {
int x = 1;
try {
return x;
} finally {
++x;
}
}

public int method2() {
int x = 1;
try {
return x;
} finally {
return ++x;
}
}
}
</pre>
</div>
</td>
</tr>
</tbody>
</table>

9、true or false？
<table class="highlighttable " style="max-width:100%; background-color:transparent; border-collapse:collapse; border-spacing:0px; word-wrap:break-word; word-break:break-all; width:910px; overflow-x:auto; margin:0px 0px 10px; padding:0px; border:1px solid rgb(204,204,204); display:block; overflow-y:hidden">
<tbody>
<tr style="word-wrap:break-word; word-break:break-all">
<td class="linenos" style="word-wrap:break-word; word-break:break-all; width:25px; text-align:right; border-right-width:1px; border-right-style:solid; border-right-color:rgb(204,204,204); background-color:rgb(245,245,245)">
<div class="linenodiv" style="margin:0px; padding:0px; font-family:微软雅黑,Arial,Helvetica,sans-serif; word-wrap:break-word; word-break:break-all">
<pre style="padding:0px 8px 0px 0px; font-family:Monaco,Menlo,Consolas,'Courier New',monospace; font-size:13px; color:rgb(51,51,51); margin-top:0px; margin-bottom:0px; line-height:20px; word-break:break-all; word-wrap:break-word; border:none; width:30px">1
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8</pre>
</div>
</td>
<td class="code" style="word-wrap:break-word; word-break:break-all">
<div class="highlight" style="margin:0px; padding:0px; font-family:微软雅黑,Arial,Helvetica,sans-serif; word-wrap:break-word; word-break:break-all">
<pre style="padding:9.5px; font-family:Monaco,Menlo,Consolas,'Courier New',monospace; font-size:13px; color:rgb(51,51,51); margin-top:0px; margin-bottom:-1px; line-height:20px; word-break:break-all; word-wrap:break-word; background-color:white; border:none">package test;

public class Test {

public static void main(String[] args) {
System.err.println(12 - 11.9 == 0.1);
}
}
</pre>
</div>
</td>
</tr>
</tbody>
</table>

10、以下代码输出是什么？
<table class="highlighttable " style="max-width:100%; background-color:transparent; border-collapse:collapse; border-spacing:0px; word-wrap:break-word; word-break:break-all; width:910px; overflow-x:auto; margin:0px 0px 10px; padding:0px; border:1px solid rgb(204,204,204); display:block; overflow-y:hidden">
<tbody>
<tr style="word-wrap:break-word; word-break:break-all">
<td class="linenos" style="word-wrap:break-word; word-break:break-all; width:25px; text-align:right; border-right-width:1px; border-right-style:solid; border-right-color:rgb(204,204,204); background-color:rgb(245,245,245)">
<div class="linenodiv" style="margin:0px; padding:0px; font-family:微软雅黑,Arial,Helvetica,sans-serif; word-wrap:break-word; word-break:break-all">
<pre style="padding:0px 8px 0px 0px; font-family:Monaco,Menlo,Consolas,'Courier New',monospace; font-size:13px; color:rgb(51,51,51); margin-top:0px; margin-bottom:0px; line-height:20px; word-break:break-all; word-wrap:break-word; border:none; width:30px"> 1
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20</pre>
</div>
</td>
<td class="code" style="word-wrap:break-word; word-break:break-all">
<div class="highlight" style="margin:0px; padding:0px; font-family:微软雅黑,Arial,Helvetica,sans-serif; word-wrap:break-word; word-break:break-all">
<pre style="padding:9.5px; font-family:Monaco,Menlo,Consolas,'Courier New',monospace; font-size:13px; color:rgb(51,51,51); margin-top:0px; margin-bottom:-1px; line-height:20px; word-break:break-all; word-wrap:break-word; background-color:white; border:none">package test;

import java.math.BigInteger;

public class Test {

public static void main(String[] args) {
BigInteger one = new BigInteger("1");
BigInteger two = new BigInteger("2");
BigInteger three = new BigInteger("3");
BigInteger sum = new BigInteger("0");
sum.add(one);
sum.add(two);
sum.add(three);
System.out.println(sum.toString());
}
}
</pre>
</div>
</td>
</tr>
</tbody>
</table>
<hr style="margin:20px 0px; border-right-width:0px; border-left-width:0px; border-top-style:solid; border-top-color:rgb(238,238,238); border-bottom-style:solid; border-bottom-color:rgb(255,255,255)">

答案：

（1）、 System.out.printf("A") == null

（2）、

第一行结果i1 + i2 = 1010

第二行异常，字符串不能和数字做减法

第三行i1 * i2 = 100

第四行i1 / i2 = 1

（3）、尽可能的从子类找，因此是string

（4）、要注意返回类型long,double,double，答案是

12

11.0

12.0

（5）、答：异常。因为子类重写父类方法时也要抛出异常。

（6）、

test.Test

test.Test

test.Base

test.Base

（7）、

true

false

（8）、

1

2

（9）、 false

（10）、0

转载自：http://my.eoe.cn/zhongcx/archive/24063.html
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