单例模式之懒汉式，饿汉式

package test.singleton;

/*懒汉式*/
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("大懒蛋");
    }
}

package test.singleton;

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