ilovejsj001的专栏

最近在开发中遇到一个问题，就是如何判断远端服务器是否已经断开连接，如果断开那么需要重新连接。首先想到socket类的方法isClosed()、isConnected()、isInputStreamShutdown()、isOutputStreamShutdown()等，但经过试验并查看相关文档，这些方法都是本地端的状态，无法判断远端是否已经断开连接。然后想到是否可以通过OutputSt

package com.me;public class Book extends Books{ String name="subname"; String author; //show方法的重载    public void show(String s){  System.out.println("sub show"); } //show1方法的重写，不是重载 public void show

 package com.me;public class Books {String name="super name";static String age="super age";public Books(){ System.out.println("super 构造方法"); System.out.println(this.name); System.out.println(name); 

 package com.me;//父类class Parent {    public Parent(){     String name="parent";     System.out.println("super");    }}//子类package com.me;public class Sub { String subname="subname"; public static voi

 1 public class Test {2 3 String s;4 5 public static void main(String args[]){6 String s;7 System.out.println(s);8 Test that=new Test();9 System.out.println(that.s);10 }11   public static void a(){12 

 public class Books {String name="super name";static String age="super age";public Books(){ System.out.println("super 构造方法"); System.out.println(this.name);(1) System.out.println(name);            //以

 package com.me;public class Parent {  public String name="parent name"; {  System.out.println("parent common 语句块"); } static {     System.out.println("parent static 语句块");  } public Parent(){  Sy

 package com.me;//父类class Parent {    public Parent(){     String name="parent";     System.out.println("super");    }}package com.me;public class Sub { String subname="subname"; private String p="p

 package com.me;class Books {String name;}class Book extends Books{ String name; String author; public Book(String name){  this.name=name; }}父类中没有构造方法只有默认的构造方法，写子类的构造方法时不需要用super来初始化父类它会自动调用父类的默认构造函