SingletonSample

gistfile1.java

public class SingletonSample {
    private static SingletonSample mInstance;

    private SingletonSample() {

    }

    public static SingletonSample getInstance() {
        if (null == mInstance) {
            synchronized(SingletonSample.class) {
                if (null == mInstance) {
                    mInstance = new SingletonSample();
                }
            }
        }
        return mInstance;
    }


    public static void main(String[] args) {
        String str = SingletonSample.getInstance().toString();
        System.out.println(str);
    }
}