Java 重载构造函数

/**

来 自 时 代      J a v a   公   众 号 - nowjava.com

**/

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import java.awt.Point;

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public class Main {

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    int x1 = 0;

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    int y1 = 0;

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    int x2 = 0;

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    int y2 = 0;

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    Main(int x1, int y1, int x2, int y2) {

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        this.x1 = x1;

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        this.y1 = y1;

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        this.x2 = x2;

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        this.y2 = y2;

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    }

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    Main(Point topLeft, Point bottomRight) {

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        this(topLeft.x, topLeft.y, bottomRight.x,/**来 自 时 代 J     a    v  a - nowjava.com**/

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            bottomRight.y);

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    }

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    Main(Point topLeft, int w, int h) {

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        this(topLeft.x, topLeft.y, topLeft.x + w,

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            topLeft.y + h);

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    }

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    void printBox() {

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        System.out.print("Box: <" + x1 + ", " + y1);

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        System.out.println(", " + x2 + ", " + y2 + ">");

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    }

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    public static void main(String[] arguments) {

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        Main rect;

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        System.out.println("Calling Box2 with coordinates "

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            + "(25,25) and (50,50):");

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        rect = new Main(25, 25, 50, 50);

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        rect.printBox();

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        System.out.println("\nCalling Box2 with points "

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            + "(10,10) and (20,20):");

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        rect= new Main(new Point(10, 10), new Point(20, 20));

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