Java 重新实现equals（）和hashCode（）方法的智能点类
重新实现equals（）和hashCode（）方法的智能点类
实例源码：
源代码：
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public class Main {/**来自 n o w j a v a . c o m**/3
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public static void main(String[] args) {5
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Point pt1 = new Point(10, 10);7
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Point pt2 = new Point(10, 10);9
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Point pt3 = new Point(12, 19);11
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Point pt4 = pt1;13
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System.out.println("pt1 == pt1: " + (pt1 == pt1));16
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System.out.println("pt1.equals(pt1): " + pt1.equals(pt1));18
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System.out.println("pt1 == pt2: " + (pt1 == pt2));21
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System.out.println("pt1.equals(pt2): " + pt1.equals(pt2));23
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System.out.println("pt1 == pt3: " + (pt1 == pt3));/** 时代Java - nowjava.com 提 供 **/26
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System.out.println("pt1.equals(pt3): " + pt1.equals(pt3));28
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System.out.println("pt1 == pt4: " + (pt1 == pt4));31
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System.out.println("pt1.equals(pt4): " + pt1.equals(pt4));33
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}35
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}37
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class Point {40
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private int x;42
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private int y;44
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public Point(int x, int y) {47
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this.x = x;49
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this.y = y;51
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}53
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/* Re-implement the equals() method */56
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public boolean equals(Object otherObject) {58
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// Are the same?60
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if (this == otherObject) {62
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return true;64
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}66
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// Is otherObject a null reference?69
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if (otherObject == null) {71
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return false;73
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}75
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// Do they belong to the same class?78
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if (this.getClass() != otherObject.getClass()) {80
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return false;82
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}84
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// Get the reference of otherObject in a SmartPoint variable87
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Point otherPoint = (Point) otherObject;89
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// Do they have the same x and y co-ordinates92
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