Java 86. Cách hiển thị thanh cuộn và sử dụng JScrollPane

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Video giải thích chi tiết

 Code chi tiết 

package model;

public class TimKiemModel {
	private String vanBan;
	private String tuKhoa;
	private String ketQua;
	
	public TimKiemModel() {
		this.vanBan = "";
		this.tuKhoa = "";
		this.ketQua = "";
	}

	public String getVanBan() {
		return vanBan;
	}

	public void setVanBan(String vanBan) {
		this.vanBan = vanBan;
	}

	public String getTuKhoa() {
		return tuKhoa;
	}

	public void setTuKhoa(String tuKhoa) {
		this.tuKhoa = tuKhoa;
	}

	public String getKetQua() {
		return ketQua;
	}

	public void setKetQua(String ketQua) {
		this.ketQua = ketQua;
	}
	
	public void timKiem() {
		int dem = 0;
		int viTri = 0;
		while(true) {
			int i = this.vanBan.indexOf(this.tuKhoa, viTri);
			if (i==-1) {
				// Tình huống không tìm thấy
				break;
			}else {
				dem++;
				viTri = i+1;
			}
		}
		this.ketQua = "Kết quả: có "+ dem + " "+this.tuKhoa;
		System.out.println(ketQua);
	}
}

package view;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.HeadlessException;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollBar;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;

import controller.TimKiemListener;
import model.TimKiemModel;

public class TimKiemView extends JFrame{
	private TimKiemModel timKiemModel;
	private JTextArea jTextArea_vanBan;
	private JTextField jTextField_tuKoa;
	private JLabel jLabel_ketQua;

	public TimKiemView() throws HeadlessException {
		this.timKiemModel = new TimKiemModel();
		this.init();
	}

	private void init() {
		this.setTitle("Tìm Kiếm");
		this.setSize(800, 600);
		this.setLocationRelativeTo(null);
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		
		Font font = new Font("Arial", Font.BOLD, 40);
		
		//Center
		JLabel jLabel_vanBan = new JLabel("Văn bản");
		jLabel_vanBan.setFont(font);
		jTextArea_vanBan = new JTextArea(100, 100);
		jTextArea_vanBan.setFont(font);
		
//		JScrollPane jScrollPane = new JScrollPane(jTextArea_vanBan, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS, JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
		JScrollPane jScrollPane = new JScrollPane(jTextArea_vanBan);
		
		// Footer
		TimKiemListener timKiemListener = new TimKiemListener(this);
		
		JLabel jLabel_tuKhoa = new JLabel("Từ khóa");
		jLabel_tuKhoa.setFont(font);
		jTextField_tuKoa = new JTextField();
		jTextField_tuKoa.setFont(font);
		
		JButton jButton_thongKe = new JButton("Thống kê");
		jButton_thongKe.setFont(font);
		jButton_thongKe.addActionListener(timKiemListener);
		jButton_thongKe.setBackground(Color.BLUE);
		jButton_thongKe.setBorderPainted(false);
		jButton_thongKe.setOpaque(true);
		
		jLabel_ketQua = new JLabel();
		jLabel_ketQua.setBackground(Color.YELLOW);
		jLabel_ketQua.setFont(font);
		jLabel_ketQua.setOpaque(true);
		
		JPanel jPanel_footer = new JPanel();
		jPanel_footer.setLayout(new GridLayout(2,2, 20, 20));
		jPanel_footer.add(jLabel_tuKhoa);
		jPanel_footer.add(jTextField_tuKoa);
		jPanel_footer.add(jButton_thongKe);
		jPanel_footer.add(jLabel_ketQua);
		
	
		this.setLayout(new BorderLayout());
		this.add(jLabel_vanBan, BorderLayout.NORTH);
		this.add(jScrollPane, BorderLayout.CENTER);
		this.add(jPanel_footer, BorderLayout.SOUTH);
		this.setVisible(true);
	}
	
	public void timKiem() {
		this.timKiemModel.setVanBan(jTextArea_vanBan.getText());
		this.timKiemModel.setTuKhoa(jTextField_tuKoa.getText());
		this.timKiemModel.timKiem();
		this.jLabel_ketQua.setText(this.timKiemModel.getKetQua());
	}
	
}

package controller;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import view.TimKiemView;

public class TimKiemListener implements ActionListener{
	private TimKiemView timKiemView;
	
	
	
	public TimKiemListener(TimKiemView timKiemView) {
		this.timKiemView = timKiemView;
	}



	@Override
	public void actionPerformed(ActionEvent e) {
		this.timKiemView.timKiem();
	}

}

package test;

import javax.swing.UIManager;

import view.TimKiemView;

public class Test {
	public static void main(String[] args) {
		try {
			UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
			new TimKiemView();
		} catch (Exception ex) {
			ex.printStackTrace();
		}	
	}
}