Java学习笔记【输入输入知识要点】

1、读取输入

首先构造Scanner对象，并与"标准输入流"System.in关联：

Scanner in = new Scanner(System.in);然后String name = in.nextLine();//输入一行可包含空格String name = in.next();//输入一个单词String name = in.nextInt();//整型String name = in.nextDouble();//double

2、格式化输出

System.out.println("asa");

3、文件输入与输出

用File对象构造一个Scanner对象：

//读取文件Scanner in = new Scanner(Paths.get("myfile.txt"));Scanner in_in = new Scanner(Paths.get("D:\\Eclipse\\myfile.txt"));//写入文件PrintWriter out = new PrintWriter("myfile.txt");