关闭扫描仪而不关闭System.in

您可以通过实现自定义装饰器来忽略close。

public class UnClosableDecorator extends InputStream {    private final InputStream inputStream;    public UnClosableDecorator(InputStream inputStream) {        this.inputStream = inputStream;    }    @Override    public int read() throws IOException {        return inputStream.read();    }    @Override    public int read(byte[] b) throws IOException {        return inputStream.read(b);    }    @Override    public int read(byte[] b, int off, int len) throws IOException {        return inputStream.read(b, off, len);    }    @Override    public long skip(long n) throws IOException {        return inputStream.skip(n);    }    @Override    public int available() throws IOException {        return inputStream.available();    }    @Override    public synchronized void mark(int readlimit) {        inputStream.mark(readlimit);    }    @Override    public synchronized void reset() throws IOException {        inputStream.reset();    }    @Override    public boolean markSupported() {        return inputStream.markSupported();    }    @Override    public void close() throws IOException {        //do nothing    }}

并在主要使用

public static void main(String[] args) throws Exception {        System.setIn(new UnClosableDecorator(System.in));}