Java单例模式

package shb.java.testThread;

public class demo1 {
    public static void main(String[] args) {
        Type type = Type.getSingleType();
        Type_2 type_2 = Type_2.getSinType_2();
    }
}
//懒汉式单例模式
class Type{
    private  static Type type = null;
    private Type(){
        
    }
    public static Type getSingleType(){
            if(type==null){
                synchronized (Type.class) {
                if(type==null){
                    type = new Type();
                }
              }    
            }
            return type;            
    }
    
}
//饿汉式单例模式
class Type_2{
    private static Type_2 type_2 = new Type_2();
    private Type_2(){
        
        
    }
    public static Type_2 getSinType_2(){
        
        return type_2;
    }
    
}