接受用户输入的一个字符串和一个字符,把字符串中所有指定的字符删除后输出。

题目:

  编写一个图形界面程序,接受用户输入的一个字符串和一个字符,把字符串中所有指定的字符删除后输出。(尽可能多的方法)   考核:1、学会使用Java API 文档 2、区分String、StringBuffer、StringBuilder类   递交资料:1、运行结果截图,能体现出用了几种方法 2、每种方法的代码截图 3、Java源文件

直接代码:
package demo1;

import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.Font;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;


import javax.swing.JTextField;
import javax.swing.JLabel;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JTextArea;
import javax.swing.JComboBox;

public class frame03 extends JFrame {

    private JPanel contentPane;
    private JTextField textField;
    private JTextField textField_1;
    private JTextArea textArea;
    private JComboBox comboBox;
    

    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    frame03 frame = new frame03();
                    frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Create the frame.
     */
    public frame03() {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 450, 300);
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        setContentPane(contentPane);
        contentPane.setLayout(null);
        
        textField = new JTextField();
        textField.setBounds(137, 38, 152, 21);
        contentPane.add(textField);
        textField.setColumns(10);
        
        textField_1 = new JTextField();
        textField_1.setBounds(137, 71, 152, 21);
        contentPane.add(textField_1);
        textField_1.setColumns(10);
        
        textArea = new JTextArea();
        textArea.setBounds(48, 102, 378, 118);
        contentPane.add(textArea);
        textArea.setColumns(6);
        Font font=new Font("黑体",Font.PLAIN,10);
        textArea.setFont(font);
        
        
        JLabel lblNewLabel = new JLabel("\u8F93\u5165\u5B57\u7B26\u4E32\uFF1A");
        lblNewLabel.setBounds(60, 41, 81, 15);
        contentPane.add(lblNewLabel);
        
        JLabel lblNewLabel_1 = new JLabel("\u8F93\u51FA\uFF1A");
        lblNewLabel_1.setBounds(10, 122, 58, 15);
        contentPane.add(lblNewLabel_1);
        
        JLabel lblNewLabel_1_1 = new JLabel("\u8F93\u5165\u5B57\u7B26\uFF1A");
        lblNewLabel_1_1.setBounds(60, 74, 67, 15);
        contentPane.add(lblNewLabel_1_1);
        
        JButton btnNewButton = new JButton("\u786E\u5B9A");
        btnNewButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String string1=textField.getText();
                StringBuffer string2= new StringBuffer(textField.getText());
                StringBuilder string3=new StringBuilder(textField.getText());
                
                String sal0=textField_1.getText();
                char[] sal1=textField_1.getText().toCharArray();
                
                //第一种:使用String将符合的字符找到并进行替换为""。
                String resultString1=string1.replace(sal0, "");
                textArea.setText("第一种:使用String将符合的字符找到并进行替换为:\n"+resultString1+'\n');
                
                //第二种string将字符串转换为字符数组,匹配删去
                int len=string1.length();
                String resultString2="";
                char[] textChar=string1.toCharArray();
                for(int i=0;i<len;i++) {
                    if(textChar[i]==sal1[0])
                        continue;
                    else {
                        resultString2+=textChar[i];
                    }
                }
                textArea.append("第二种string将字符串转换为字符数组,匹配删去:\n"+resultString2+'\n');
                
                //第三种:使用StringBuffer:
                StringBuffer StringBuffer = new StringBuffer("");
                for(int i=0;i<string2.length();i++) {
                    if(sal1[0]==string2.charAt(i))
                        continue;
                    else
                        StringBuffer.append(string2.charAt(i));
                }
                
                String resultString3=StringBuffer.toString();
                textArea.append("第三种:使用StringBuffer解决线程问题,并用charAt()方法寻找对应字符:\n"+resultString3+'\n');
                
                //第四种:使用StringBuilder:循环删除字符,因为删除一个字符就会移位,所以要重新计算位置,也是最简单的方法:
                
                while(string3.indexOf(sal0)!=-1) {
                    string3=string3.deleteCharAt(string3.indexOf(sal0));
                }
                String resultString4=string3.toString();
                textArea.append(resultString4+'\n');
                
            }
        });
        btnNewButton.setBounds(177, 230, 67, 23);
        contentPane.add(btnNewButton);
        
        comboBox = new JComboBox();
        comboBox.setBounds(392, 171, 34, 23);
        contentPane.add(comboBox);
        
        
    }
}

 

运行截图:

posted @ 2021-03-31 13:08  焕不涣  阅读(749)  评论(0编辑  收藏  举报