Java 클래스에서 언제 'this' 키워드를 사용해야 합니까?

class Foo {
    private String name;

    public void setName(String name) {
        this.name = name; // Assigns the parameter value to the instance variable
    }
}

class Foo {
    public String useBarMethod() {
        Bar theBar = new Bar();
        return theBar.barMethod(this); 
        // Passes the current "Foo" object to "barMethod"
    }

    public String getName() {
        return "Foo";
    }
}

class Foo {
    public Foo() {
        this("Some default value for bar"); // Calls the constructor with the provided parameter
    }

    public Foo(String bar) {
        // Do something with the provided bar value
    }
}