Java单例模式简单示例

package org.aaa;
public class ex {
  private static ex e;
  public static ex getEx() {
    if (e == null) {
      e=new ex();
    }
    return e;
  }
  private ex() {
    System.out.println("执行单立模式");
  }
}

package org.aaa;
public class ssss {
  public static void main(String[] ages){
    ex e1=ex.getEx();
    ex e2=ex.getEx();
    if(e1==e2){
      System.out.println("同一个对象");
    }else{
      System.out.println("不同的对象");
    }
  }
}