enumdemo.java

来自「java 的好东西,,开发的基本语言语法教程」· Java 代码 · 共 43 行

enum Apple {
  Jonathan,
  GoldenDel,
  RedDel,
  Winesap,
  Cortland
}
public class EnumDemo {
  public static void main(String args[])  
  {
    Apple ap;
 
    ap = Apple.RedDel;
    // Output an enum value. 
    System.out.println("Value of ap: " + ap);
    System.out.println();
 
    ap = Apple.GoldenDel;

    // Compare two enum values. 
    if(ap == Apple.GoldenDel)
      System.out.println("ap contains GoldenDel.\n");
 
    // Use an enum to control a switch statement. 
    switch(ap) {
      case Jonathan: 
        System.out.println("Jonathan is red."); 
        break; 
      case GoldenDel: 
        System.out.println("Golden Delicious is yellow."); 
        break; 
      case RedDel:  
        System.out.println("Red Delicious is red."); 
        break; 
      case Winesap:
        System.out.println("Winesap is red."); 
        break; 
      case Cortland:
        System.out.println("Cortland is red."); 
        break; 
    } 
  } 
}