【java】打印流的基本实现及java.io.PrintStream、java.io.PrintWriter示例

package 打印流;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;

class MyPrint{
    private OutputStream out;
    public MyPrint(OutputStream out){
        this.out=out;
    }
    public void print(String str) throws IOException{
        out.write(str.getBytes());
    }
    public void print(int i) throws IOException{
        print(String.valueOf(i));
    }
    public void print(byte b) throws IOException{
        print(String.valueOf(b));
    }
    public void print(short s) throws IOException{
        print(String.valueOf(s));
    }
    public void print(long l) throws IOException{
        print(String.valueOf(l));
    }
    public void print(float f) throws IOException{
        print(String.valueOf(f));
    }
    public void print(double d) throws IOException{
        print(String.valueOf(d));
    }
    public void print(boolean b) throws Exception{
        print(String.valueOf(b));
    }
    public void print(char c) throws IOException{
        print(String.valueOf(c));
    }
    public void close() throws IOException{
        out.close();
    }
}
public class TestPrint {
    public static void main(String[] args) throws IOException {
        MyPrint myPrint=new MyPrint(new FileOutputStream(new File("D:"+File.separator+"testA.txt")));
        myPrint.print(8.8);
        myPrint.print('a');
        myPrint.close();
    }
}

package 打印流;

import java.io.File;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintStream;
import java.io.PrintWriter;

public class TestPrintStream {
    public static void main(String[] args) throws IOException {
        PrintStream printStream=new PrintStream(new FileOutputStream(new File("D:"+File.separator+"Test.txt")));
        printStream.print(true);
        printStream.println("abc中国人");
        printStream.close();
        
        PrintWriter printWriter=new PrintWriter(new FileWriter(new File("D:"+File.separator+"testA.txt")));
        printWriter.print(false);
        printWriter.println(89898.23);
        printWriter.close();
    }    
}

package 打印流;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintStream;

public class TestPrintStream {
    public static void main(String[] args) throws IOException {
        String name = "张三";
        int age = 20;
        float height = 1.7586f;
        PrintStream printStream = new PrintStream(new FileOutputStream(
                new File("D:" + File.separator + "Test.txt")));
        printStream.printf("姓名：%s，年龄：%d，身高：%1.2f", name, age, height);
        printStream.close();

        // PrintWriter printWriter=new PrintWriter(new FileWriter(new
        // File("D:"+File.separator+"testA.txt")));
        // printWriter.close();
        System.out.println(String.format("姓名：%s，年龄：%d，身高：%1.2f", name, age,
                height));
    }
}

输出操作建议用打印流，而不是输出流