下面看一下下面的代码:

import java.io.Console;

public class Main {

	public static void main(String[] args){
		Console console = System.console();
		String password ;
		password = new String(console.readPassword());
		System.out.println("password="+password);
	}
}

程序运行后,输入字符没有显示,回车后,打印出结果.如下图

看到这里,大家可能都希望能够输入一个字符,显示一个星号之类的,这样有一定的提示作用.于是我查看了Console的源码,发现通过Console是实现不了的

 public char[] readPassword() {
        return readPassword("");
    }

 public char[] readPassword(String fmt, Object ... args) {
        char[] passwd = null;
        synchronized (writeLock) {
            synchronized(readLock) {
                try {
                    echoOff = echo(false);
                } catch (IOException x) {
                    throw new IOError(x);
                }
                IOError ioe = null;
                try {
                    if (fmt.length() != 0)
                        pw.format(fmt, args);
                    passwd = readline(true);
                } catch (IOException x) {
                    ioe = new IOError(x);
                } finally {
                    try {
                        echoOff = echo(true);
                    } catch (IOException x) {
                        if (ioe == null)
                            ioe = new IOError(x);
                        else
                            ioe.addSuppressed(x);
                    }
                    if (ioe != null)
                        throw ioe;
                }
                pw.println();
            }
        }
        return passwd;
    }

Java控制台下密码的输入,布布扣,bubuko.com

Java控制台下密码的输入