D_pfei的博客

类属性（static） 创建时初始化 public static String name = "word"; 初始化块中初始化 { name = "the hero"; } 构造器中初始化 默认构造器会初始化为空值null 对象属性（非静态） 创建时初始化 public String name = "some hero"; 初始化块中初始化 { name = "the h...

不可以，非静态必须先实例，可以传参调用 package Test; import java.util.Arrays; import java.util.Scanner; public class Test{ public void method1(){ System.out.println("调用对象/非静态方法"); } public static vo...

package Test; import java.util.Arrays; import java.util.Scanner; public class Test{ String name; //姓名 float hp; //血量 float armor; //护甲 int moveSpeed; //移动速度 public Test(){ } ...

package Test; import java.util.Arrays; import java.util.Scanner; public class Test{ public static void main(String[] args){ int i = 1; boolean b = !(i++ == 3) ^ (i++ ==2) &&am...

public class Test{ public static void main(String[] args){ int i = 1; int j = ++i + i++ + ++i + ++i + i++; // i 2 2 3 4 5 5 6 // j 2 4 ...

package Test; import java.util.Arrays; public class Test{ String name; int price; public static void main(String[] args){ Test[] a = new Test[2]; a[0].name = "jake"; ...

package Test; import java.util.Arrays; public class Test{ public static void main(String[] args){ short a = 1; short b = 1; //short c = a+b;//报错 short c = (short)(a...

package Test; import java.util.Arrays; public class Test{ public static void main(String[] args){ new Test().method1(5); } int i = 1; //属性名是i public void method1(int i){ //参数也是...

package Test; import java.util.Arrays; public class Test{ private final int a; public Test(int a){ this.a = a; } public static void main(String[] args){ new Test(5).met...