高级内存

对象与对象

对象作为方法传参

Point.java
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public class Point {    ...    public boolean onRight(Point target) {        return target.x > this.x;    }    ...}

Driver.java
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public class Driver {    ...    public static void main(String[] args) {        Point p1 = new Point(1, 2);        Point p2 = new Point(3, 4);         boolean result = p1.onRight(p2);         System.out.println(result);    }    ...}

对象作为方法返回值

Point.java
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public class Point {    ...    public Point flippedPoint() {        return new Point(-y, -x);    }    ...}

Driver.java
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public class Driver {    ...    public static void main(String[] args) {        Point p1 = new Point(1, 2);         Point p2 = p1.flippedPoint();         System.out.println(p2);    }    ...}

对象作为属性

Rect.java
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public class Rect {    private Point origin;    private int width;    private int height;     public int maxY() {        return origin.getX() + width;    }     ...}

Driver.java
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public class Driver {    ...    public static void main(String[] args) {        Point p1 = new Point(1, 2);        Rect rect = new Rect();        rect.setPoint(p1);        rect.setWidth(3);        rect.setHeight(6);         int right = rect.maxY();         System.out.println(right);    }    ...}