Use “this” and method (in Java)

What about using the "this" method in Java? Are there selective or mandatory situations?

The only thing I encountered was calling the method in the class in the class. But it is optional This is a stupid example, just to show what I mean:

public class Test {

    String s;

    private String hey() {
        return s;
    }

    public String getS(){
        String sm = this.hey();
        // here I Could just write hey(); without this
        return sm;
    }
}

Solution

Three obvious situations you need:

>Call another constructor in the same class as the first part of the constructor > distinguish between local variables and instance variables (whether in constructors or other methods) > pass a reference to the current object to another method

Here are three examples:

public class Test
{
    int x;

    public Test(int x)
    {
        this.x = x;
    }

    public test()
    {
        this(10);
    }

    public void foo()
    {
        Helper.doSomethingWith(this);
    }

    public void setX(int x)
    {
        this.x = x;
    }
}

I believe there are some strange situations. Using inner classes, you need super this. x. But they should be avoided, IMO

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