runtimeexception_ex.java

来自「里面还有Java书中的所有立体源码」· Java 代码 · 共 18 行

public class RuntimeException_ex
{
    public static void main(String args[]) 
    {
        int a[] = null;
        a[0] = 0;                           //空对象异常NullPointerException
        
        String str = null;
        System.out.println(str.length());   //空对象异常NullPointerException
        
        int b[] = new int [-1];             //负数组长度异常NegativeArraySizeException
        
        Object obj = new Object();
        String str = (String) obj;          //类型强制转换异常ClassCastException

    }
}