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java的print,printf,println以及输入

java中有三种方式向控制台输入信息,分别是print,printf,println,现在简单介绍一下他们之间的异同。

  • printf主要是继承了C语言的printf的一些特性,可以进行格式化输出
  • print就是一般的标准输出,但是不换行
  • println和print基本没什么差别,就是最后会换行

看一下他们的效果:


 

print:

java的print,printf,println以及输入

结果:

java的print,printf,println以及输入

 

从结果中可以明显看到,print输出内容之后,不会换行,光标定到最后一个字符之后。


 

 println:

java的print,printf,println以及输入

结果:

java的print,printf,println以及输入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

还是很好区分的。


 

如果你学过c语言,对printf应该很是了解啦,我在这里再重复一遍。

什么是格式化输出呢?格式化输出就是向指定的地方(如:屏幕)输出指定格式的内容。

不同的语言对数据的格式化的表达形式稍微有点差别,java中一些数据的格式化形式:

'd' 整数 结果被格式化为十进制整数
'o' 整数 结果被格式化为八进制整数
'x', 'X' 整数 结果被格式化为十六进制整数
'e', 'E' 浮点 结果被格式化为用计算机科学记数法表示的十进制数
'f' 浮点 结果被格式化为十进制数
'g', 'G' 浮点 根据精度和舍入运算后的值,使用计算机科学记数形式或十进制格式对结果进行格式化。
'a', 'A' 浮点 结果被格式化为带有效位数和指数的十六进制浮点数

第一种的颜色是之适用整形,红色只适应浮点型,我为什么说这个呢?在c语言中能自动强制类型转换,所以,类型不对,程序也能正常运行,但在java中,类型不对程序就不能运行。我会在后边举例的。

再给从c语言阵营的一个小提醒:float 数据后必须跟 “f”,否则java会把数据看成double类型。

java的print,printf,println以及输入

 

看看效果:

java的print,printf,println以及输入

下边举个错误的例子:

1 public class Test{2     public static void main(String[] args) {3         int i = 10;4         System.out.printf("%e \n",i);5     }6 }

 

看看会出现什么错误:

java的print,printf,println以及输入

不合法类型转换异常,所以,写程序时要对号入座啊。

 

print, printf, println就说这么多啦,下边介绍一下从从控制台输入数据的方式,以后会在IO输入/输出时再详细介绍java的输入。

输出我们用的是System.out,那么又没有System.in呢?哈哈,有是有,但System.in只能获取字节,我们要想获得数字和字符串直接调用System.in是不能实现的,如果可以,你可以自己写个类封装一下System.in,实现获取数字与字符串的接口。你可能已经想到啦,java已经提供了这样的类:Scanner,你可以通过Scanner对象获取各种数据。

1 import java.util.Scanner;2 public class Test{3     public static void main(String[] args) {        4         Scanner s = new Scanner(System.in);//System.in作为Scanner构造函数的参数5         System.out.println(s.nextLine());//nextLine获取输入的数据直到遇见回车键,回车键也会接受6         System.out.println("over");  7     }8 }

 

java的print,printf,println以及输入

一定要注意那个注释部分回车键也会接受,否则会进入到一个小坑里呦,举个例子:

import java.util.Scanner;public class Test{    public static void main(String[] args) {                Scanner s = new Scanner(System.in);//System.in作为Scanner构造函数的参数                int i = s.nextInt();        System.out.println(i);                System.out.println("please input a word:");//输入一个单词        String str = s.nextLine();        System.out.println(str);                System.out.println("over");            }}

 

看结果:

java的print,printf,println以及输入没有输入单词程序就结束啦,为什么呢?当你输入“100”数字时,敲回车结束,nextInt()函数不会接受回车键,但nextLine会接受缓存区里的数据和回车键,此时缓存区有个回车键,所以nextLine()接收了回车键,如果缓存区是空的会让你输入内容,所以,你应该明白了为什么你没有输入程序就结束了的原因了吧。


 

好啦,今天就写这么多。

我很想用心打造精品,但限于知识和语言表达能力,其中必有很多不足,望大家海涵啊。

java的print,printf,println以及输入

 




原标题:java的print,printf,println以及输入

关键词:JAVA

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