第五章

选择题：AAADC
1.使用多重 catch 语句时，异常子类一定要位于异常父类之前。应把catch(Exception e)放在最后一个catch块。
2.`package Exception;

public class Person {
private String name="";
private int age=0;
private String sex=“男”;
public void setAge(int age) throws Exception{
if(age>0&&age<100)
this.sex=sex;
else{
throw new Exception(“年龄必须在1~100之间！”);
}
}
public void print(){
System.out.println(this.name+"("+this.sex+","+this.age+“岁)”);
}

}
package Exception;

public class TextException2 {

public static void main(String[] args) {
	Person person=new Person();
	try{
		person.setAge(199);
		person.print();
	}catch(Exception e){
		e.printStackTrace();
	}
	
}

}
进入if语句—〉抛出异常——〉进入catch—〉输出2----〉进入finally—>输出3—〉执行剩余代码—〉输出4
3.`package bdqn.t206.java5;

import java.util.Scanner;

public class TextName {

public static void main(String[] args) {
	Scanner scanner=new Scanner(System.in);
	System.out.print("请输入课程代号（1~3之间的数字）：");
	int num=scanner.nextInt();
	switch(num){
	   case 1:
		   System.out.println("C#编程");
		   break;
	   case 2:
		   System.out.println("Java编程");
		   break; 
	   case 3:
		   System.out.println("SQL基础");
		   break;
		default:
			 System.out.println("你输入的不是1~3之间的数字！");
			 break;
	}
	System.out.println("欢迎提出建议！");

}

}
4.`public class word2 {
@SuppressWarnings(“unused”)
private int age;

public void setAge(int age) throws Exception {
	if (age < 1 || age > 100) {
		throw new Exception("年龄必须在1到100之间！");
	} else {
		this.age = age;
		System.out.println("赋值成功");
	}
}


public int num(String flag) throws Exception {
	try {
		int a = Integer.parseInt(flag);
		return a;
	} catch (Exception e) {
		throw new Exception("必须输入1到100之间的数字！");
	}

}

}

import java.util.Scanner;

public class word2_1 {
	public static void main(String[] args) throws Exception{
		word2 word = new word2();
		@SuppressWarnings("resource")
		Scanner input = new Scanner(System.in);
		System.out.print("请输入1-100的数字：");
		try {		
			int a = word.num(input.next());	
			word.setAge(a);
		} catch (Exception e) {
			e.printStackTrace();
		}
		
	}
}

5.package bdqn.t206.java5;

public class Markdowm {

public static void main(String[] args) {
	int arr[]=new int[3];
	try{
		arr[4]=1;
	}catch(ArrayIndexOutOfBoundsException e){
		System.out.println("对不起，你设置的数组越界了！");
	}

}

}