java基础：try-finally中的return关键字

try-finally中的return关键字

return语句的本质：

1. return语句获取到变量的地址
2. return将获取的地址返回，也就是return本质是传地址

测试案例代码：

public class Demo02 {
    public static void main(String[] args) {
        Too too=new Too();
        StringBuilder t1=test(too);
        System.out.println("return语句返回的:"+t1+"\t返回值的hashCode:"+t1.hashCode());
        System.out.println("finaly里面修改的:"+too.num+"\tfinaly的hashCode:"+too.num.hashCode());

    }
    public static StringBuilder test(Too too) {
        try {
            too.num=new StringBuilder("try");
            System.out.println("try字符串的hashcode:"+("try").hashCode());
            System.out.println("StringBuilder里的try的hashCode:"+too.num.hashCode());//--语句1
            return too.num; //语句2
        } finally {
            too.num=new StringBuilder("finaly");//语句3
            System.out.println("finaly的hashCode:"+too.num.hashCode());//语句4
        }}}

class Too{
    StringBuilder num=new StringBuilder("你好");
}

输出结果：

try字符串的hashcode:115131
StringBuilder里的try的hashCode:460141958
finaly的hashCode:1163157884
return语句返回的:try	返回值的hashCode:460141958
finaly里面修改的:finaly	finaly的hashCode:1163157884