testprintwriter.java

本书是一本为Java学习者在基础内容学习结束后进行课程设计时提供参考的指导书

package apibook.c3.s10;

import java.io.*;
import java.util.*;

//测试PrintWriter类
public class TestPrintWriter {
  public TestPrintWriter() {
  }
  public static void main(String[] args) {
    String str = "abc";
    char[] chs = new char[str.length()];
    str.getChars(0, str.length(), chs, 0);

    String filename = "TestPrintWriter.txt";
    PrintWriter out;
    try {
        out = new PrintWriter(new FileWriter(filename));
    } catch (IOException e) {
        System.err.println(e);
        return;
    }

    out.print(new Date());          // 输出对象
    out.println(new Date());        // date

    out.print(str);                 // String
    out.println(str);
    out.print(chs);                 // char[]
    out.println(chs);
    out.print(' ');                 // char
    out.println(' ');
    out.print(5);                   // int
    out.println(5);
    out.print(5L);                  // long
    out.println(5L);
    out.print(1.23f);               // float
    out.println(1.23f);
    out.print(1.23);                // double
    out.println(1.23);
    out.print(true);                // boolean
    out.println(true);

    if (out.checkError()) {
        System.err.println("Got errors printing");
        System.exit(-1);
    }

    out.write('A');
    out.write(str);
    char[] buf = str.toCharArray();
    out.write(buf, 0, buf.length);
    out.flush();
    out.close();
  }

}