本文实例讲述了java中enum的用法。分享给大家供大家参考。具体分析如下：
1. 基本用法
2. 枚举是对象
枚举隐含地继承了java.lang.Enum，所以它具有java.lang.Enum的属性和方法。遍历枚举：
private String field1;
private String field2;
EnumDemo(String val1, String val2){
this.field1 = val1;
this.field2 = val2;
}
public void printFields(){
System.out.println(this.field1);
System.out.println(this.field2);
}
public static void main(String[] args) {
EnumDemo.AOBJECT.printFields();
}
}
private final double mass; // in kilograms
private final double radius; // in meters
Planet(double mass, double radius) {
this.mass = mass;
this.radius = radius;
}
private double mass() { return mass; }
private double radius() { return radius; }
// universal gravitational constant (m3 kg-1 s-2)
public static final double G = 6.67300E-11;
double surfaceGravity() {
return G * mass / (radius * radius);
}
double surfaceWeight(double otherMass) {
return otherMass * surfaceGravity();
}
public static void main(String[] args) {
Double earthWeight = 120;
for(Planet p: Planet.values()){
System.out.println(p.surfaceGravity());
System.out.println(p.surfaceWeight(earthWeight/EARTH.surfaceGravity()));
}
}
}
String[] myArgs;
Singleton(String[] args){
this.myArgs = args;
}
public static Singleton getInstance(){
return INSTANCE;
}
public static void main(String[] args) {
for(String arg : INSTANCE.myArgs)
System.out.println(arg);
}
}
希望本文所述对大家的Java程序设计有所帮助。
