Java枚举equals()方法与示例
枚举类equals()方法
equals()方法在java.lang包中可用。
equals()方法用于检查该对象与给定对象的相等性或不相等性，换句话说，可以说该方法用于比较两个对象。
equals()方法是一种非静态方法，只能通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。
在比较两个对象时，equals()方法不会引发异常。
语法：
public final boolean equals(Object obj2);
参数：
对象ob2–表示要比较的对象。
返回值：
此方法的返回类型为布尔值，它根据给定的情况返回以下值：
如果Object1等于Object2，则返回true。
如果Object1不等于Object2，则返回false。
示例
//Java程序演示示例
//的布尔equals（Objectobj2）方法
//枚举类
enum Weeks {
SUN,
MON,
TUE,
WED,
THU,
FRI,
SAT;
}
public class Equals {
public static void main(String args[]) {
Weeks w1 = Weeks.SUN;
Weeks w2 = Weeks.MON;
Weeks w3 = Weeks.TUE;
Weeks w4 = Weeks.WED;
Weeks w5 = Weeks.THU;
Weeks w6 = Weeks.FRI;
Weeks w7 = Weeks.SAT;
boolean res1 = w1.equals(w2);
boolean res2 = w2.equals(w3);
boolean res3 = w3.equals(w4);
boolean res4 = w4.equals(w2);
boolean res5 = w5.equals(w6);
System.out.println("Is" + " " + w1.name() + " " + "same as" + " " + w2.name() + " " + res1);
System.out.println("Is" + " " + w2.name() + " " + "same as" + " " + w3.name() + " " + res2);
System.out.println("Is" + " " + w3.name() + " " + "same as" + " " + w4.name() + " " + res3);
System.out.println("Is" + " " + w4.name() + " " + "same as" + " " + w2.name() + " " + res4);
System.out.println("Is" + " " + w5.name() + " " + "same as" + " " + w6.name() + " " + res5);
}
}输出结果
Is SUN same as MON false Is MON same as TUE false Is TUE same as WED false Is WED same as MON false Is THU same as FRI false