单例模式

恶汉式：

public class SingleEHan {
	private static SingleEHan slh = new SingleEHan();

	private SingleEHan() {
	}

	public static SingleEHan getSingEHan() {
		System.out.println("单例模式:饿汉式");
		return slh;

	}
}

public class TestEHan {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		SingleEHan.getSingEHan();

	}

}

懒汉式：

public class SingleLanHan {
	private static SingleLanHan slh;

	private SingleLanHan() {

	}

	public static SingleLanHan getSingle() {
		if (slh == null) {
			slh = new SingleLanHan();
		}
		System.out.println("单例模式:懒汉式");
		return slh;
	}

}

public class TestLanHan {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		SingleLanHan.getSingle();

	}

}