import java.util.Scanner;

/**

* Create Time: 2018-03-17 07:28

*

* @author sheting

*/

public class TestEraserThread {

public static void main(String[] args) {

Scanner scanner = new Scanner(System.in);

while (true) {

System.out.print("请输入名称：");

String name = scanner.next();

System.out.print("请输入密码：");

EraserThread eraserThread = new EraserThread('#');

eraserThread.start();

String password = scanner.next();

eraserThread.setActive(false);

if ("sheting".equals(name) && "123456".equals(password)) {

System.out.println(String.format("欢迎%s", name));

break;

} else {

System.out.println("用户名或密码输入错误！请重新输入");

}

}

}

}

class EraserThread extends Thread {

private boolean active;

private String mask;

public EraserThread() {

this('*');

}

public EraserThread(char maskChar) {

active = true;

mask = "\010" + maskChar;

}

public void setActive(boolean active) {

this.active = active;

}

public boolean isActive() {

return active;

}

@Override

public void run() {

while (isActive()) {

System.out.print(mask);

try {

Thread.sleep(50);

} catch (InterruptedException e) {

e.printStackTrace();

}

}

}

}

运行结果：

说明：在文本模式输出\010表示返回一个字符位置。

在Java1.6之后可以使用console.readPassword()方法隐藏用户输入的文本。

import java.io.Console;

/**

* Create Time: 2018-03-17 09:19

*

* @author sheting

*/

public class Test {

public static void main(String[] args) {

Console console = System.console();

if (console == null) {

System.out.println("Couldn't get Console instance, maybe you're running this from within an IDE?");

System.exit(0);

}

char passwordArray[] = console.readPassword("Enter your secret password: ");

console.printf("Password entered was: %s%n", new String(passwordArray));

}

}

运行结果：