LambdaExpression.java

interface TouchCallback {
    public void apply(int times);
}

class TouchMe {
    private int times = 0;
    private TouchCallback onTouch;

    TouchMe(TouchCallback onTouch) {
        this.onTouch = onTouch;
    }

    public void touch() {
        onTouch.apply(++times);
    }
}

public class LambdaExpressionExample {
    public static void main(String args[]) {
        TouchMe touchMe = new TouchMe(new TouchCallback() {
            @Override
            public void apply(int times) {
                System.out.println(times);
            }
        });

        touchMe.touch();    // 1
        touchMe.touch();    // 2
        touchMe.touch();    // 3
        touchMe.touch();    // 4
        touchMe.touch();    // 5
    }
}