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java中讲讲PrintStream的用法,举例?

作者:互联网

1.2 PrintStream的用法  

马 克-to-win:从学java第一天,我们就经常用到System.out.println(),实际上查阅文档可知,System.out就是Sun 编的一个PrintStream的实例对象。PrintStream顾名思义,Sun编它,就是用来打印的,以各种各样的格式,打印各种各样的数据, (boolean,char,double,float)。下面的例子就介绍了println(int x),print(String)和print(char c)的用法。

例:1.2.1
import java.io.*;
public class TestMark_to_win {
    public static void main(String args[]) throws Exception {
        byte inp[] = new byte[3];
        inp[0] = 97;inp[1] = 98;inp[2] = 99;
        for (int i = 0; i < 3; i++) {
            /*there is no such method as println(Byte x), only sun. have the
following public void println(int x) if you want to print out
"a", use System.out.println((char)inp[i]);*/
            System.out.println(inp[i]);
        }

        for (int i = 0; i < 3; i++) {
/*public void print(char c)Print a character.*/
            System.out.println((char) inp[i]);
        }
        char c='z';
        System.out.println(c);
        String s="我们是good123";
        System.out.println(s);
        double d=3.14;
        System.out.println(d);
    }
}
       
更多请见:https://blog.csdn.net/qq_44639795/article/details/102529877

标签:java,PrintStream,讲讲,int,inp,System,char,println,out
来源: https://www.cnblogs.com/xiaolongxia1922/p/15388668.html