java中讲讲PrintStream的用法,举例?
[学习笔记]
1.2 printstream的用法
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);
}
}
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