如何使用setter而不是构造函数作为最终变量？

public class MyClass {
    private final String myVariable;
}

public class MyClass {
    private final String myVariable;

    public MyClass(String myVariable) {
        this.myVariable = myVariable;
    }

    public void setMyVariable(String myVariable) {
        // Do nothing, since myVariable is final and can't be changed
    }
}

public class MyClass {
    private String myVariable;

    public MyClass(String myVariable) {
        this.myVariable = myVariable;
    }

    public void setMyVariable(String myVariable) {
        this.myVariable = myVariable;
    }
}

MyClass obj = new MyClass("initialValue");
obj.setMyVariable("newValue");