單例模式之懶漢式，餓漢式

package test.singleton;

/*懶漢式*/
public class singletonOne {

 public singletonOne(){

 }

 private static final singletonOne singOne=new singletonOne();

 public static singletonOne getSingOne(){
 return singOne;
 }

 public void showSingletonOne(){
 System.out.println("太笨");
 }
}

class SingeletonTwo{
 public SingeletonTwo(){

 }

 public static SingeletonTwo singTwo=null;
 public static SingeletonTwo getInstance(){
 if(singTwo==null){
 singTwo =new SingeletonTwo();
 }
 return singTwo;
 }
 public void twoTest(){
 System.out.println("大懶蛋");
 }
}

package test.singleton;

public class singeletonOneTest {
    public static void main(String [] args){
 singletonOne singeOne=singletonOne.getSingOne();
 singeOne.showSingletonOne();
 SingeletonTwo two=SingeletonTwo.getInstance();
 two.twoTest();
    }
}