浙大《面向对象程序设计--java语言》学习笔记（第八周：异常处理与输入输出）

8.1 异常

ArrayIndex.java

package exception;

import java.util.Scanner;

public class ArrayIndex {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		int[] a = new int[10];
		int idx;
		Scanner in = new Scanner(System.in);
		idx = in.nextInt();
		
		try {
			a[idx]=10;
			System.out.println("hello");
		} catch(ArrayIndexOutOfBoundsException e) {
			System.out.println("Caught");
		}
	}

}

运行结果

//输入
10

//控制台反馈
Caught

 

 另一个程序

package exception;

import java.util.Scanner;

public class ArrayIndex {
	
	public static void f() {
		int[] a = new int[10];
		a[10] = 10;
		//由于上一行有异常，所以接下来的打印hello并不会输出
		System.out.println("hello");
	}
	
	public static void main(String[] args) {
		// TODO Auto-generated method stub

		try {
			f();
		} catch(ArrayIndexOutOfBoundsException e) {
			System.out.println("Caught");
		}
		System.out.println("main ended");
	}

}

运行直接结果

Caught
main ended

8.2 异常机制

 

8.3 流