java81-静态代码块

//静态代码块
class test16 {
private static final String URL;
private static final String DEVICE;
private static final String USER;
private static final String ROOT;
static test16 self;
static {
URL="歌谣";
DEVICE="笔记本电脑";
USER="root";
ROOT="歌谣";
if(self==null){
self=new test16();
}
}

public static String getURL() {
return URL;
}

public static String getDEVICE() {
return DEVICE;
}

public static String getUSER() {
return USER;
}

public static String getROOT() {
return ROOT;
}

public test16(){

}
}
定义一个测试类public class test17 {
public static void main(String[] args){
System.out.println(test16.getDEVICE());
}
}

运行结果