If a method contains a constant value hard-coded in it, it is very helpful to have a refactoring option to turn this into a parameter and make all invocations use the constant value by default.

Before Refactoring:

public class Sample {
    public void invoker1() {
        show();
    }
    public void invoker2() {
        show();
    }

    private void show() {
        System.out.println("Hello");
    }
}

After Refactoring:

public class Sample {
    public void invoker1() {
        show("Hello");
    }
    public void invoker2() {
        show("Hello");
    }

    private void show(String value) {
        System.out.println(value);
    }
}