1. 先寫一個Singleton的class
package stone;
public class Singleton {
private static Singleton instance;
private Singleton() {}
public static Singleton getInstance(){
if(instance==null)
instance= new Singleton();
return instance;
}
}
2. 再寫一個TestSingleton的class
package stone;
public class TestSingleton {
public static void main(String[] args) {
Singleton s1=Singleton.getInstance();
Singleton s2=Singleton.getInstance();
if(s1==s2)
System.out.println("s1=s2");
else
System.out.println("s1<>s2");
}
}
3. 運行TestSingleton, 結果如下:
s1=s2
4. 測試單例模式成功.