导包的概述和使用
使用不同包下的类时,使用的时候要写类的全路径,写起来太麻烦了
为了简化带包的操作,java提供了导包的功能
导包的格式:
格式:import包名:
范例:import cn.itcast.Teacher
package cn.itcast;
public class Teacher {
public void teach(){
System.out.println("用爱成就每一位学员");
}
}
package com.ithema_29;
import cn.itcast.Teacher;
/*
测试类
*/
public class Demo {
public static void main(String[] args) {
// Teacher t = new Teacher();
/*
cn.itcast.Teacher t = new cn.itcast.Teacher();
t.teach();
cn.itcast.Teacher t2 = new cn.itcast.Teacher();
t2.teach();
*/
// java.util.Scanner sc = new java.util.Scanner(System.in);
Teacher t = new Teacher();
t.teach();
Teacher t2 = new Teacher();
t2.teach();
}
}