如何在Java中使用this关键字

public class Person {
    private String name;

    public void setName(String name) {
        this.name = name; // this.name 是成员变量，name 是参数
    }
}

public class Person {
    private String name;
    private int age;

    public Person() {
        this("未知", 0); // 调用带两个参数的构造器
    }

    public Person(String name, int age) {
        this.name = name;
        this.age = age;
    }
}

public class Button {
    public void click() {
        EventManager.register(this); // 把当前按钮对象注册到事件管理器
    }
}

public class Calculator {
    private int result;

    public Calculator add(int value) {
        this.result += value;
        return this; // 返回当前对象
    }

    public Calculator multiply(int value) {
        this.result *= value;
        return this;
    }

    public int getResult() {
        return this.result;
    }
}

Calculator calc = new Calculator();
int finalResult = calc.add(5).multiply(2).getResult(); // 链式调用