lx3_25.java

jbuilder2005

//lx3_25.java
class lx3_25{
    static void demoproc() {
        try {
            throw new NullPointerException("异常测试"); //生成一个异常
        } catch (NullPointerException e) {
            System.out.println("第一级捕获到异常");
            throw e;  //再次抛出异常
        }
    }
    public static void main(String args[]){
        try {
            demoproc();
        } catch (NullPointerException e) { //捕获到异常e
            System.out.println("第二级捕获的异常信息: " + e);
        }
    }
}