Java中String类型是引用数据类型么？

Question

String s="123"; 这个变量s是个引用变量么？如果是那是不是里面存了个地址？

请看下面这段代码：

package temptest;
public class Test5 {
     public void exchange(String a) {
         a="112233";
    }
     public static void main(String[] args) {
        String s="123";
        Test5 t=new Test5();
        t.exchange(s);
        System.out.println(s);
        }
}

为什么s还是"123"啊？

Answer 1

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