Java编程异常简单代码示例

package 异常;
import java.util.Arrays;
import java.util.InputMismatchException;
import java.util.Scanner;
public class TestTriangle {
  public static void triangle(int a, int b,int c) throws IllegalArgumentException, InputMismatchException{
    int x[] = new int[3];
    x[0] = a;
    x[1] = b;
    x[2] = c;
    Arrays.sort(x);
    if ((x[0]+x[1]>x[2])&&(x[2]-x[1]<x[0]))
      System.out.println("三角形的三边长为："+a+","+b+","+c);
    else
      throw new IllegalArgumentException();
  }
  public static void main(String[] args) {
    int a=0, b=0, c=0;
    Scanner in = new Scanner(System.in);
    System.out.println("请分别输入三角形的三边长：");
    try{
      a = in.nextInt();
      b = in.nextInt();
      c = in.nextInt();
      triangle(a, b, c);
    }catch(InputMismatchException e1){
      System.err.println("请输入整数作为三角形的边长！");
      e1.printStackTrace();
    }catch(IllegalArgumentException e2){
      System.err.println(a+","+b+","+c+"不能构成三角形");
    }
  }
}

package 异常;
import java.util.InputMismatchException;
import java.util.Scanner;
public class TestArray {
  public static void main(String[] args) {
    int a[] = new int[5];
    System.out.println("请输入5个数：");
    System.out.println("最后输入一个非数字结束输入操作。");
    Scanner in = new Scanner(System.in);
    try{
      int i = 0;
      while(in.hasNextDouble()){   
        a[i] = in.nextInt();
        i++;
      }
      if(i<5)
        throw new ArrayIndexOutOfBoundsException();
      for(int j=0;j<5;j++)
        System.out.print(a[j]+" ");
      System.out.println();
    }catch(InputMismatchException e1){
      System.err.println("请输入整数作为数组元素！");
      e1.printStackTrace();
    }catch(ArrayIndexOutOfBoundsException e2){
      System.err.println("请输入5个数！");
      e2.printStackTrace();
    }finally{
      System.out.print("感谢使用本程序！");
    }
  }
}