静态域的测试

/*
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 * To change this template file, choose Tools | Templates
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 */

package coreJava;

import java.util.Date;
import java.util.logging.Logger;

/**
 *
 * @author scown
 */
public class javaFile {
    private int id;
    private static int nextId = 1;
    public javaFile() {
    }
    
    public int  getId() {
        return id;
    }

    public static int getNextId() {
        return nextId;
    }

    public void exe() {
        System.out.println("javaFile output:parm" );
    }
    
    public  void setId(){
        id = nextId;
        nextId ++ ;
    }

}


/*
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 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */

/**
 *
 * @author Administrator
 */
import coreJava.javaFile;
import java.io.File;
import java.io.FileNotFoundException;
import java.util.Date;
import java.util.Scanner;
import java.util.logging.Level;
import java.util.logging.Logger;

public class helloWorld {
    public static void main(String[] parm){
          javaFile newTest1 = new javaFile();
          javaFile newTest2 = new javaFile();
          newTest1.setId();
          newTest2.setId();
          System.out.println(newTest2.getId() );
    }

}