Java - this的使用方法

this在内部获得当前对象的引用时调用:

(1) return返回当前对象;

(2) 构造器调用还有一个构造器, 带參数;

(3) 參数的名称和数据成员的名称同样;

注意:

this构造器在方法中仅仅能调用一次;

非构造器不能调用带參数的this.

//:Flower.java

/**

 * 构造器

 *

 * Created by C.L.Wang on 15/7/12.

 */

public class Flower {

    int petalCount = 0;

    String s = "initial value";

    Flower(int petals) {

        petalCount = petals;

        System.out.println("int arg only, petalCount = " + petalCount);

    }

    Flower(String ss) {

        s = ss;

        System.out.println("String arg only, petalCount = " + s);

    }

    Flower(String s, int petals) {

        this(petals);

        this.s = s;

        System.out.println("String & int args");

    }

    Flower() {

        this("hi", 47);

        System.out.println("default construction (no args)");

    }

    void printPetalCount() {

        System.out.println("petalCount = " + petalCount + " s = " + s);

    }

    public static void main(String[] args) {

        Flower x = new Flower();

        x.printPetalCount();

    }

}

/**

 * Output:

 int arg only, petalCount = 47

 String & int args

 default construction (no args)

 petalCount = 47 s = hi

 *///:~

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