package wanzai; public class Fruit { private static Fruit color=null; private Fruit() { } public static Fruit getcolor(){ if(color==null){ color=new Fruit(); } return color; } public void setcolor() { System.out.println(); } public static void main(String[] args) { System.out.println("苹果颜色是红色"); Fruit color1=Fruit.getcolor(); color1.setcolor(); System.out.println("香蕉颜色是黄色"); Fruit color2=Fruit.getcolor(); color2.setcolor(); } }
package wanzai; public class Fruit1 { public double price(double price){ return price; } public int price(int weigth){ return weigth; } public static void main(String[] args) { Fruit1 apple=new Fruit1(); System.out.println("苹果的价格是"+apple.price(5.5)); System.out.println("苹果的重量是"+apple.price(10)); Fruit1 banana=new Fruit1(); System.out.println("香蕉的价格是"+banana.price(4.2)); System.out.println("香蕉的重量是"+banana.price(5)); } }