java怎么将JTextField的边框设跟字体设置成黑色

java怎么将JTextField的边框设跟字体设置成黑色，如最后的那个图

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package counterGui;

import javax.swing.*;

import java.awt.*;


public class counter extends JFrame {


    public counter() {
        setLayout(null);
        setTitle("GUI实验题");
        setLocation(200, 200);
        setSize(500, 400);
        setDefaultCloseOperation(EXIT_ON_CLOSE);


        JTextArea textField = new JTextArea("数据转换");
        Font x = new Font("Serif", Font.BOLD,20);
        textField.setFont(x); //文本加粗跟设置字体大小
        textField.setBounds(200, 10, 120, 25);
        textField.setOpaque(false); //设置背景透明
        textField.setForeground(Color.red); //字体颜色

        add(textField);

        JTextField outputField = new JTextField(100);
        outputField.setBounds(0, 40, 550, 50);
        outputField.setText("12345678");


        outputField.setEnabled(false);
        add(outputField);

        JRadioButton button1 = new JRadioButton("2");
        JRadioButton button2 = new JRadioButton("8");
        JRadioButton button3= new JRadioButton("10");
        JRadioButton button4 = new JRadioButton("16");

        button1.setBounds(140, 90, 50, 40);
        button2.setBounds(200, 90, 50, 40);
        button3.setBounds(260, 90, 50, 40);
        button4.setBounds(320, 90, 50, 40);
        add(button1);
        add(button2);
        add(button3);
        add(button4);

        JTextArea textField1 = new JTextArea("转换成==>>");
        textField1.setBounds(200, 140, 120, 25);
        Font y = new Font("Serif", Font.BOLD,20);
        textField1.setFont(y); //文本加粗跟设置字体大小
        textField1.setOpaque(false); //设置背景透明
        textField1.setForeground(Color.BLUE); //字体颜色

        add(textField1);

        JTextField outputField1 = new JTextField(100);
        outputField1.setBounds(0, 170, 550, 50);
        outputField1.setText("75bcd15");
        outputField1.setOpaque(false);//设为透明
        outputField1.setEnabled(false);
        add(outputField1);

        JRadioButton button5= new JRadioButton("2");
        JRadioButton button6 = new JRadioButton("8");
        JRadioButton button7= new JRadioButton("10");
        JRadioButton button8 = new JRadioButton("16");

        button5.setBounds(140, 220, 50, 40);
        button6.setBounds(200, 220, 50, 40);
        button7.setBounds(260, 220, 50, 40);
        button8.setBounds(320, 220, 50, 40);
        add(button5);
        add(button6);
        add(button7);
        add(button8);

        final JButton btn1 = new JButton("OK");
        final JButton btn2 = new JButton("Exit");
        btn1.setBounds(190, 260, 60, 40);
        btn2.setBounds(260, 260, 60, 40);
        add(btn1);
        add(btn2);

        setVisible(true);
    }

    public static void main(String[] args) {
        new counter();


    }
}