java this關鍵字的作用

java this關鍵字的作用:

1、消除屬性的歧義，給類中屬性設置值的時候，傳值的參數要和類中屬性區分開來。

public class  Student{
    private int age;
    private String name;
    
    public Student(int age, String name) {
        this.age = age;
        this.name = name;
    }
}

2、引用類中的其他構造方法

public class  Student{
    private int age;
    private String name;
    
    public Student(int age, String name) {
        this.age = age;
        this.name = name;
    }
    // 無參構造，this引用有參構造
    // 如果是有參中調用無參構造時候this必須放在第一個
    public Student() {
        this(18, "巴扎黑");
    }
}

3、作爲參數傳遞

public class ThisTest {
    public ThisTest() {
        print(this);
    }

    private void print(ThisTest thisTest) {
        System.out.println("print " +thisTest);
    }

    public static void main(String[] args) {
        ThisTest test = new ThisTest();
        System.out.println("main " + test);
    }
}

4、在內部類中訪問外部類對象

public class ThisInnerTest {
    private String name;

    class InnerClass {
        public InnerClass() {
            ThisInnerTest thisInnerTest = ThisInnerTest.this;
            String outerName = thisInnerTest.name;
        }
    }
}