Java基础巩固系列 标准的输入输出流

代码示例：

 /*
     * 标准的输入输出流
     * 标准的输出流：System.out
     * 标准的输入流：System.in
     *
     * 题目：
     * 从键盘输入字符串，要求将读取到的整行字符串转成大写输出。然后继续进行输入操作，
     * 直至当输入“e”或者“exit”时，退出程序。
     * */
    @Test
    public void test2() {
        BufferedReader br = null;
        try {
            InputStream is = System.in;
            InputStreamReader isr = new InputStreamReader(is);
            br = new BufferedReader(isr);
            String str;
            while (true) {
                System.out.println("请输入字符串：");
                str = br.readLine();
                if (str.equalsIgnoreCase("e") || str.equalsIgnoreCase("exit")) {
                    break;
                }
                String str1 = str.toUpperCase();
                System.out.println(str1);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (br != null) {
                try {
                    br.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

练习：

public class MyInput {

    public String nextString() {
        BufferedReader br = null;
        String str = null;
        try {
            InputStreamReader isr = new InputStreamReader(System.in);
            br = new BufferedReader(isr);
            str = br.readLine();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (br != null) {
                try {
                    br.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return str;
    }

    public int nextInt() {
        return Integer.parseInt(nextString());
    }

    public boolean nextBoolean() {
        return Boolean.parseBoolean(nextString());
    }

    public static void main(String[] args) {
        MyInput i = new MyInput();
        System.out.println("请输入一个字符串：");
        String s = i.nextString();
        System.out.println(s);
//        System.out.println("请输入一个布尔值：");
//        Boolean s = i.nextBoolean();
//        System.out.println(s);
    }

}