帮忙批改JTextField 的高度

帮忙修改JTextField 的高度
刚学习swing,做了个界面,很难看,不知道如何修改JTextField的高度,请谁帮我改改
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.FlowLayout;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.event.*;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JTextField;
import javax.swing.JPanel;
import javax.swing.JList;
import javax.swing.JScrollPane;
import javax.swing.DefaultListModel;




public class weather extends JFrame {

  private String[] entries={"苹果","香蕉","橘子","核桃"} ;
 
  private JTextField country; 
  private JList jl;
  private JTextField latitude;
  private JTextField currentTime;
  private JTextField wind;
  private JTextField visibilityField;
  private JTextField skycondition;
  private JTextField dewpoint;
  private JTextField relativehumidity;
  private JTextField presure;
  private JButton search;
  private DefaultListModel listModel;
   
  private JPanel p1,p2;


  public weather() {
   
  setUpUIComponent();
  setUpEventListener();
  setTitle("Weather Report ");
  setSize(640, 580);
  setResizable(false); 
  setVisible(true);
  }
   
  private void setUpUIComponent(){
 
  p1 = new JPanel();
  p2 = new JPanel();
 
  country=new JTextField(10);
  latitude=new JTextField(12);
  currentTime=new JTextField(12);
  wind=new JTextField(12);
  visibilityField=new JTextField(12);
  skycondition=new JTextField(12);
  dewpoint=new JTextField(12);
  relativehumidity=new JTextField(12);
  presure=new JTextField(12);
  search=new JButton("SEARCH");
   
  listModel = new DefaultListModel();
  jl = new JList(listModel);
   
  // jl=new JList(entries);
  JScrollPane jsp=new JScrollPane(jl);
   
  jl.setVisibleRowCount(8);
  jsp.setBounds(20,20,80,120);
   
  p1.add(country);
  p1.add(search);
  p1.add(jsp);
   
  p2.add(new JLabel("latitude"));
  p2.add(latitude);
  p2.add(new JLabel("time"));
  p2.add(currentTime);
  p2.add(new JLabel("wind"));
  p2.add(wind);
  p2.add(new JLabel("visibility"));
  p2.add(visibilityField);
  p2.add(new JLabel("skycondition"));
  p2.add(skycondition);
  p2.add(new JLabel("dewpoint"));
  p2.add(dewpoint);
  p2.add(new JLabel("relativehumidity"));
  p2.add(relativehumidity);
  p2.add(new JLabel("presure"));
  p2.add(presure);
   
  this.getContentPane().setLayout(new FlowLayout()); 
  this.setLayout(new GridLayout(1,2));

  p2.setLayout(new GridLayout(8, 2));
  this.add(p1);
  this.add(p2);
  }