标准输入输出

public class TestStream {
    
    /**
     * 标准输出,显示器(console)
     */
    @Test
    public void testSystemOut() throws Exception{
        System.setOut(new PrintStream(new FileOutputStream("d:/arch/a.txt")));
        System.out.println("helloworldxxxxxxxxxxxx");
    }
    
    /**
     * 标准输入(键盘)
     */
    @Test
    public void testSystemIn() throws Exception{
        InputStream in = System.in ;
        BufferedReader br = new BufferedReader(new InputStreamReader(in));
        String line = null ;
        while((line = br.readLine()) != null){
            if(line.equals("quit")){
                System.exit(-1);
            }
            System.out.println("hello : " + line);
        }
    }
}