内存练习 - 对象组合Q37 E03

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 {    public int x;    public int y;    // ... 省略构造方法}

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public class Circle {    public Point center;    public int radius;    // ... 省略构造方法}

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public class Driver {    public static void main(String[] args) {        Circle c1 = new Circle();        Circle c2 = new Circle();        // 检查点    }}

检查点 答案

练习 2

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public class Point {    public int x;    public int y;    // ... 省略构造方法}

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public class Circle {    public Point center;    public int radius;    // ... 省略构造方法}

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public class Driver {    public static void main(String[] args) {        Point p1 = new Point(1, 2);        Circle c1 = new Circle(p1, 5);        Circle c2 = new Circle(p1, 6);        c1.center.x = 7;        int value = c2.center.x;        // 检查点    }}

检查点 答案

练习 3

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public class Point {    public int x;    public int y;    // ... 省略构造方法}

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public class Circle {    public Point center;    public int radius;    // ... 省略构造方法}

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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);        Circle c1 = new Circle(p1, 5);        Circle c2 = new Circle(p2, 6);        c1.center.x = 7;        int value = c2.center.x;        // 检查点    }}

检查点 答案