在Java中复制对象

Question

我了解到，当您在Java中修改变量时，它不会改变它所基于的变量

int a = new Integer(5);
int b = a;
b = b + b;
System.out.println(a); // 5 as expected
System.out.println(b); // 10 as expected

我对对象也假设了类似的情况。考虑一下这个类。

public class SomeObject {
    public String text;

    public SomeObject(String text) {
        this.setText(text);
    }

    public String getText() {
        return text;
    }   

    public void setText(String text) {
        this.text = text;
    }
}

在我试过这个代码后，我搞糊涂了。

SomeObject s1 = new SomeObject("first");
SomeObject s2 = s1;
s2.setText("second");
System.out.println(s1.getText()); // second as UNexpected
System.out.println(s2.getText()); // second as expected

Answer 1

T copyDeep(T input) { 
    return new Gson().fromJson(new Gson().toJson(input), T.class);
}