singleton2.java

来自「郭克华j2ee高级框架实战教学视频源代码 这个是比较值得一看的 由郭克华博士」· Java 代码 · 共 30 行

package singleton;

class FileOpe{
	public static FileOpe fo = null;
	public static synchronized FileOpe getInstance(){//线程同步
		if(fo==null){
			fo = new FileOpe();
		}
		return fo;
	}
	private FileOpe(){
		System.out.println("构造函数");
	}
	public void createFile(){
		System.out.println("创建文件");
	}
}

public class Singleton2 {
	public static void main(String[] args) {
		FileOpe fo1 = FileOpe.getInstance();
		fo1.createFile();
		//1000行代码
		FileOpe fo2 = FileOpe.getInstance();
		fo2.createFile();

	}

}