try-finally中的return关键字
return语句的本质：
- return语句获取到变量的地址
- 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