Java开发网 - 关于static的迷惑

Topic: 关于static的迷惑

1.关于static的迷惑

Posted by: AchillesA
Posted on: 2004-07-31 19:47

import c05.connection.*;
public class E11_ConnectionManager {
public static void main(String args[]) {
Connection c =
ConnectionManager.getConnection();
while(c != null) {
System.out.println Coffee

;
c.doSomething();
c = ConnectionManager.getConnection();
}
}
} ///:~

//: c05:connection:Connection.java
package c05.connection;
public class Connection {
private static int counter = 0;//+--------这里不用static行不行
private int id = counter++;
Connection() {}
public String toString() {
return "Connection " + id;
}
public void doSomething() {}
} ///:~

//: c05:connection:ConnectionManager.java
package c05.connection;
public class ConnectionManager {
private static Connection[] pool = //+---------为什么是static
new Connection[10];
private static int counter = 0;
static { //+--------为什么这里要用static
for(int i = 0; i < pool.length; i++)
pool[i] = new Connection();
}
// Very simple -- just hands out each one once:
public static Connection getConnection() {
if(counter < pool.length)
return pool[counter++];
return null;
}
} ///:~
我对static的用法和作用的认识都太模糊了，有没有专门讲static的文章啊，或是谁给我仔细讲讲static