在Java中同时计算大小写字母
好的！我有一个计算字符串中单个字符的类的程序。无论是大写还是小写。如果您输入一个字符串，然后要求输入字符在Java中同时计算大小写字母,java,jframe,indexof,Java,Jframe,Indexof,好的！我有一个计算字符串中单个字符的类的程序。无论是大写还是小写。如果您输入一个字符串，然后要求输入字符'a'，那么程序会工作，如果只有一个'a'，则计数将为零。如果我在字符搜索中键入“A”，它将计为1。我的问题是我需要char搜索来计算一个字符的所有实例，不管它是大写还是小写，并将它们作为一个字符计数一起计算 代码如下： package index; import java.awt.Container; import java.awt.FlowLayout; import java.awt.
'a'package index;
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.LayoutManager;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.*;
public class Index extends JFrame
{
/**
*
*/
private static final long serialVersionUID = 1L;
protected JFrame mainFrame;
protected JTabbedPane tabbedPane = new JTabbedPane(JTabbedPane.TOP);
protected JPanel panel;
private JTextArea textSearch;
private JTextField charSearch;
private JLabel message1;
private JLabel message2;
private char aChar;
public Index()
{
mainFrame = new JFrame("Character Finder");
mainFrame.setBounds(100, 100, 450, 300);
mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
tabbedPane.setBounds(0, 0, 434, 261);
mainFrame.getContentPane().add(tabbedPane);
panel = new JPanel();
tabbedPane.addTab("Index", panel);
panel.setLayout(null);
message1 = new JLabel("Enter text to be search: ");
message1.setBounds(79, 55, 140, 27);
panel.add(message1);
textSearch = new JTextArea();
textSearch.setBounds(220, 25, 223, 94);
panel.add(textSearch);
message2 = new JLabel("Enter a charater: ");
message2.setBounds(179, 159, 100, 14);
panel.add(message2);
charSearch = new JTextField();
charSearch.setBounds(285, 156, 64, 20);
panel.add(charSearch);
mainFrame.setSize(500, 350);
mainFrame.setVisible(true);
textSearch.setVisible(true);
textSearch.setEditable(true);
addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
});
TextSearchHandler tHandler = new TextSearchHandler();
charSearch.addActionListener(tHandler);
}
class TextSearchHandler implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
int count = 0;
int current = 0;
String instring;
String inChar;
instring = textSearch.getText();
if(instring.equals(""))
{
instring = ("");
textSearch.setText("");
}
inChar = charSearch.getText();
if(inChar.equals(""))
{
inChar = ("");
charSearch.setText("");
}
current = instring.indexOf(inChar, 0);
while(current != -1)
{
inChar.equalsIgnoreCase(instring);
aChar = instring.charAt(0);
current = instring.indexOf(inChar, current + 1);
count++;
}
JOptionPane.showMessageDialog(null, "Character " + "'" + inChar + "'" + " count: "
+ count++, "Results", JOptionPane.PLAIN_MESSAGE);
}
}
public static void main(String[] args)
{
new Index();
}
}
当我进行字符搜索时，我必须键入两次。我必须输入大写版本来计算该版本，删除该版本，然后输入小写版本来计算该版本。任何帮助都将不胜感激 您可以使用
字符串。toUpperCase（）查看一下您可以使用
字符串。toUpperCase（）查看一下您可以使用
字符串。toUpperCase（）查看一下您可以使用
字符串。toUpperCase（）查看一下您可以在比较时使用String的
equalsIgnoreCase（）equalsIgnoreCase（）equalsIgnoreCase（）import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTabbedPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
public class Index extends JFrame
{
/**
*
*/
private static final long serialVersionUID = 1L;
protected JFrame mainFrame;
protected JTabbedPane tabbedPane = new JTabbedPane(JTabbedPane.TOP);
protected JPanel panel;
private JTextArea textSearch;
private JTextField charSearch;
private JLabel message1;
private JLabel message2;
private JCheckBox ignoreCaseCheck;
public Index()
{
mainFrame = new JFrame("Character Finder");
mainFrame.setBounds(100, 100, 450, 300);
mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
tabbedPane.setBounds(0, 0, 434, 261);
mainFrame.getContentPane().add(tabbedPane);
panel = new JPanel();
tabbedPane.addTab("Index", panel);
panel.setLayout(null);
message1 = new JLabel("Enter text to be search: ");
message1.setBounds(79, 55, 140, 27);
panel.add(message1);
textSearch = new JTextArea();
textSearch.setBounds(220, 25, 223, 94);
panel.add(textSearch);
message2 = new JLabel("Enter a charater: ");
message2.setBounds(179, 159, 100, 14);
panel.add(message2);
charSearch = new JTextField();
charSearch.setBounds(285, 156, 64, 20);
panel.add(charSearch);
ignoreCaseCheck = new JCheckBox("Ignore case while search.");
ignoreCaseCheck.setBounds(179, 176, 200, 20);
panel.add(ignoreCaseCheck);
mainFrame.setSize(500, 350);
mainFrame.setVisible(true);
textSearch.setVisible(true);
textSearch.setEditable(true);
addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
});
TextSearchHandler tHandler = new TextSearchHandler();
charSearch.addActionListener(tHandler);
}
class TextSearchHandler implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
int count = 0;
int current = 0;
String instring;
String inChar;
instring = ignoreCaseCheck.isSelected() == true ? textSearch.getText().toLowerCase() : textSearch.getText();
if (instring.equals(""))
{
instring = ("");
textSearch.setText("");
}
inChar = ignoreCaseCheck.isSelected() == true ? charSearch.getText().toLowerCase() : charSearch.getText();
if (inChar.equals(""))
{
inChar = ("");
charSearch.setText("");
}
current = instring.indexOf(inChar, 0);
while (current != -1)
{
inChar.equalsIgnoreCase(instring);
instring.charAt(0);
current = instring.indexOf(inChar, current + 1);
count++;
}
JOptionPane.showMessageDialog(null, "Character " + "'" + charSearch.getText() + "'" + " count: " + count++, "Results", JOptionPane.PLAIN_MESSAGE);
}
}
public static void main(String[] args)
{
new Index();
}
}`
我稍微修改了您的代码，以接受用户输入的有关搜索忽略案例的信息。如果选中“忽略大小写”，则使用要搜索的搜索字符串和文本的小写版本进行搜索。您可以根据实际需要对其进行修改和增强
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTabbedPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
public class Index extends JFrame
{
/**
*
*/
private static final long serialVersionUID = 1L;
protected JFrame mainFrame;
protected JTabbedPane tabbedPane = new JTabbedPane(JTabbedPane.TOP);
protected JPanel panel;
private JTextArea textSearch;
private JTextField charSearch;
private JLabel message1;
private JLabel message2;
private JCheckBox ignoreCaseCheck;
public Index()
{
mainFrame = new JFrame("Character Finder");
mainFrame.setBounds(100, 100, 450, 300);
mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
tabbedPane.setBounds(0, 0, 434, 261);
mainFrame.getContentPane().add(tabbedPane);
panel = new JPanel();
tabbedPane.addTab("Index", panel);
panel.setLayout(null);
message1 = new JLabel("Enter text to be search: ");
message1.setBounds(79, 55, 140, 27);
panel.add(message1);
textSearch = new JTextArea();
textSearch.setBounds(220, 25, 223, 94);
panel.add(textSearch);
message2 = new JLabel("Enter a charater: ");
message2.setBounds(179, 159, 100, 14);
panel.add(message2);
charSearch = new JTextField();
charSearch.setBounds(285, 156, 64, 20);
panel.add(charSearch);
ignoreCaseCheck = new JCheckBox("Ignore case while search.");
ignoreCaseCheck.setBounds(179, 176, 200, 20);
panel.add(ignoreCaseCheck);
mainFrame.setSize(500, 350);
mainFrame.setVisible(true);
textSearch.setVisible(true);
textSearch.setEditable(true);
addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
});
TextSearchHandler tHandler = new TextSearchHandler();
charSearch.addActionListener(tHandler);
}
class TextSearchHandler implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
int count = 0;
int current = 0;
String instring;
String inChar;
instring = ignoreCaseCheck.isSelected() == true ? textSearch.getText().toLowerCase() : textSearch.getText();
if (instring.equals(""))
{
instring = ("");
textSearch.setText("");
}
inChar = ignoreCaseCheck.isSelected() == true ? charSearch.getText().toLowerCase() : charSearch.getText();
if (inChar.equals(""))
{
inChar = ("");
charSearch.setText("");
}
current = instring.indexOf(inChar, 0);
while (current != -1)
{
inChar.equalsIgnoreCase(instring);
instring.charAt(0);
current = instring.indexOf(inChar, current + 1);
count++;
}
JOptionPane.showMessageDialog(null, "Character " + "'" + charSearch.getText() + "'" + " count: " + count++, "Results", JOptionPane.PLAIN_MESSAGE);
}
}
public static void main(String[] args)
{
new Index();
}
}`
我稍微修改了您的代码，以接受用户输入的有关搜索忽略案例的信息。如果选中“忽略大小写”，则使用要搜索的搜索字符串和文本的小写版本进行搜索。您可以根据实际需要对其进行修改和增强
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTabbedPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
public class Index extends JFrame
{
/**
*
*/
private static final long serialVersionUID = 1L;
protected JFrame mainFrame;
protected JTabbedPane tabbedPane = new JTabbedPane(JTabbedPane.TOP);
protected JPanel panel;
private JTextArea textSearch;
private JTextField charSearch;
private JLabel message1;
private JLabel message2;
private JCheckBox ignoreCaseCheck;
public Index()
{
mainFrame = new JFrame("Character Finder");
mainFrame.setBounds(100, 100, 450, 300);
mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
tabbedPane.setBounds(0, 0, 434, 261);
mainFrame.getContentPane().add(tabbedPane);
panel = new JPanel();
tabbedPane.addTab("Index", panel);
panel.setLayout(null);
message1 = new JLabel("Enter text to be search: ");
message1.setBounds(79, 55, 140, 27);
panel.add(message1);
textSearch = new JTextArea();
textSearch.setBounds(220, 25, 223, 94);
panel.add(textSearch);
message2 = new JLabel("Enter a charater: ");
message2.setBounds(179, 159, 100, 14);
panel.add(message2);
charSearch = new JTextField();
charSearch.setBounds(285, 156, 64, 20);
panel.add(charSearch);
ignoreCaseCheck = new JCheckBox("Ignore case while search.");
ignoreCaseCheck.setBounds(179, 176, 200, 20);
panel.add(ignoreCaseCheck);
mainFrame.setSize(500, 350);
mainFrame.setVisible(true);
textSearch.setVisible(true);
textSearch.setEditable(true);
addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
});
TextSearchHandler tHandler = new TextSearchHandler();
charSearch.addActionListener(tHandler);
}
class TextSearchHandler implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
int count = 0;
int current = 0;
String instring;
String inChar;
instring = ignoreCaseCheck.isSelected() == true ? textSearch.getText().toLowerCase() : textSearch.getText();
if (instring.equals(""))
{
instring = ("");
textSearch.setText("");
}
inChar = ignoreCaseCheck.isSelected() == true ? charSearch.getText().toLowerCase() : charSearch.getText();
if (inChar.equals(""))
{
inChar = ("");
charSearch.setText("");
}
current = instring.indexOf(inChar, 0);
while (current != -1)
{
inChar.equalsIgnoreCase(instring);
instring.charAt(0);
current = instring.indexOf(inChar, current + 1);
count++;
}
JOptionPane.showMessageDialog(null, "Character " + "'" + charSearch.getText() + "'" + " count: " + count++, "Results", JOptionPane.PLAIN_MESSAGE);
}
}
public static void main(String[] args)
{
new Index();
}
}`
我稍微修改了您的代码，以接受用户输入的有关搜索忽略案例的信息。如果选中“忽略大小写”，则使用要搜索的搜索字符串和文本的小写版本进行搜索。您可以根据实际需要对其进行修改和增强
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTabbedPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
public class Index extends JFrame
{
/**
*
*/
private static final long serialVersionUID = 1L;
protected JFrame mainFrame;
protected JTabbedPane tabbedPane = new JTabbedPane(JTabbedPane.TOP);
protected JPanel panel;
private JTextArea textSearch;
private JTextField charSearch;
private JLabel message1;
private JLabel message2;
private JCheckBox ignoreCaseCheck;
public Index()
{
mainFrame = new JFrame("Character Finder");
mainFrame.setBounds(100, 100, 450, 300);
mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
tabbedPane.setBounds(0, 0, 434, 261);
mainFrame.getContentPane().add(tabbedPane);
panel = new JPanel();
tabbedPane.addTab("Index", panel);
panel.setLayout(null);
message1 = new JLabel("Enter text to be search: ");
message1.setBounds(79, 55, 140, 27);
panel.add(message1);
textSearch = new JTextArea();
textSearch.setBounds(220, 25, 223, 94);
panel.add(textSearch);
message2 = new JLabel("Enter a charater: ");
message2.setBounds(179, 159, 100, 14);
panel.add(message2);
charSearch = new JTextField();
charSearch.setBounds(285, 156, 64, 20);
panel.add(charSearch);
ignoreCaseCheck = new JCheckBox("Ignore case while search.");
ignoreCaseCheck.setBounds(179, 176, 200, 20);
panel.add(ignoreCaseCheck);
mainFrame.setSize(500, 350);
mainFrame.setVisible(true);
textSearch.setVisible(true);
textSearch.setEditable(true);
addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
});
TextSearchHandler tHandler = new TextSearchHandler();
charSearch.addActionListener(tHandler);
}
class TextSearchHandler implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
int count = 0;
int current = 0;
String instring;
String inChar;
instring = ignoreCaseCheck.isSelected() == true ? textSearch.getText().toLowerCase() : textSearch.getText();
if (instring.equals(""))
{
instring = ("");
textSearch.setText("");
}
inChar = ignoreCaseCheck.isSelected() == true ? charSearch.getText().toLowerCase() : charSearch.getText();
if (inChar.equals(""))
{
inChar = ("");
charSearch.setText("");
}
current = instring.indexOf(inChar, 0);
while (current != -1)
{
inChar.equalsIgnoreCase(instring);
instring.charAt(0);
current = instring.indexOf(inChar, current + 1);
count++;
}
JOptionPane.showMessageDialog(null, "Character " + "'" + charSearch.getText() + "'" + " count: " + count++, "Results", JOptionPane.PLAIN_MESSAGE);
}
}
public static void main(String[] args)
{
new Index();
}
}`
谢谢大家，我从你们每个人身上学到了一些见解，我做了以下改变
instring = textSearch.getText().toLowerCase();
if(instring.equals(""))
{
instring = ("");
textSearch.setText("");
}
inChar = charSearch.getText().toLowerCase();
if(inChar.equals(""))
{
inChar = ("");
charSearch.setText("");
}
current = instring.indexOf(inChar, 0);
while(current != -1)
{
inChar.equalsIgnoreCase(instring);
aChar = instring.charAt(0);
current = instring.indexOf(inChar, current + 1);
count++;
}
JOptionPane.showMessageDialog(null, "Character " + "'" + charSearch.getText() + "'" + " count: "
+ count++, "Results", JOptionPane.PLAIN_MESSAGE);
现在它工作得很好！！！我很感激 谢谢各位，我从你们每个人身上学到了一些见解，我做了以下改变
instring = textSearch.getText().toLowerCase();
if(instring.equals(""))
{
instring = ("");
textSearch.setText("");
}
inChar = charSearch.getText().toLowerCase();
if(inChar.equals(""))
{
inChar = ("");
charSearch.setText("");
}
current = instring.indexOf(inChar, 0);
while(current != -1)
{
inChar.equalsIgnoreCase(instring);
aChar = instring.charAt(0);
current = instring.indexOf(inChar, current + 1);
count++;
}
JOptionPane.showMessageDialog(null, "Character " + "'" + charSearch.getText() + "'" + " count: "
+ count++, "Results", JOptionPane.PLAIN_MESSAGE);
现在它工作得很好！！！我很感激 谢谢各位，我从你们每个人身上学到了一些见解，我做了以下改变
instring = textSearch.getText().toLowerCase();
if(instring.equals(""))
{
instring = ("");
textSearch.setText("");
}
inChar = charSearch.getText().toLowerCase();
if(inChar.equals(""))
{
inChar = ("");
charSearch.setText("");
}
current = instring.indexOf(inChar, 0);
while(current != -1)
{
inChar.equalsIgnoreCase(instring);
aChar = instring.charAt(0);
current = instring.indexOf(inChar, current + 1);
count++;
}
JOptionPane.showMessageDialog(null, "Character " + "'" + charSearch.getText() + "'" + " count: "
+ count++, "Results", JOptionPane.PLAIN_MESSAGE);
现在它工作得很好！！！我很感激 谢谢各位，我从你们每个人身上学到了一些见解，我做了以下改变
instring = textSearch.getText().toLowerCase();
if(instring.equals(""))
{
instring = ("");
textSearch.setText("");
}
inChar = charSearch.getText().toLowerCase();
if(inChar.equals(""))
{
inChar = ("");
charSearch.setText("");
}
current = instring.indexOf(inChar, 0);
while(current != -1)
{
inChar.equalsIgnoreCase(instring);
aChar = instring.charAt(0);
current = instring.indexOf(inChar, current + 1);
count++;
}
JOptionPane.showMessageDialog(null, "Character " + "'" + charSearch.getText() + "'" + " count: "
+ count++, "Results", JOptionPane.PLAIN_MESSAGE);