内存练习 - 函数 与 对象Q37 E06

从 Main 的 run 方法 开始绘制内存

在每个检查点，检查你画的内存是否跟答案一致

练习 1

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public class Point {    private int x;    private int y;     public Point() {    }     public Point(int x, int y) {        this.x = x;        this.y = y;    }     public void add(Point delta){        this.x += delta.x;        this.y += delta.y;    }}

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public class Driver {    public static void main(String[] args) {        Point p1 = new Point(3, 4);        Point p2 = new Point(1, 1);        p1.add(p2);        // 检查点    }}

检查点 答案

练习 2

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public class Point {    private int x;    private int y;     public Point() {    }     public Point(int x, int y) {        this.x = x;        this.y = y;    }     public Point added(int dx, int dy) {        return new Point(x + dx, y + dy);    }}

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public class Driver {    public static void main(String[] args) {        Point p1 = new Point(3, 4);        Point p2 = p1.added(1, 1);        // 检查点    }}

检查点 答案

练习 3

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public class Point {    private int x;    private int y;     public Point() {    }     public Point(int x, int y) {        this.x = x;        this.y = y;    }     public Point added(Point point){        return new Point(x + point.x, y + point.y);    }}

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public class Driver {    public static void main(String[] args) {        Point p1 = new Point(3, 4);        Point p2 = new Point(1, 1);        Point p3 = p1.added(p2);        // 检查点    }}

检查点 答案