Java提供了两类主要的异常:runtime exception和checked exception。checked 异常也就是我们经常遇到的IO异常,以及SQL异常都是这种异常。大家知道java运行异常吗?下面我们就给大家详细介绍一下吧。
NullPointerException:空指针异常类
示例:
package com.darkmi.basic;
public class Test {
public static void main(String[] args) {
System.out.println(toUpper(null));
}
public static String toUpper(String str){
return str.toUpperCase();
}
}
异常信息如下: Exception in thread "main" java.lang.NullPointerException
at com.darkmi.basic.Test.toUpper(Test.java:11)
at com.darkmi.basic.Test.main(Test.java:6)
ArrayIndexOutOfBoundsException:数组下标越界异常
示例:
package com.darkmi.basic;
public class Test {
public static void main(String[] args) {
int[] a = {0,1,2,3};
System.out.println(a[4]);
}
}
异常信息如下:
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 4
at com.darkmi.basic.Test.main(Test.java:7)
来源: http://www.51edu.com/it/bckf/462742.html