Java技能树-GUI-AWT-组件-TextField类

1 需求

• 获取输入框长度
  • public int getColumns() 默认值是0
• 设置输入框长度
  • public void setColumns(int columns)
• 获取输入框内容
• 设置输入框内容
  • public TextField(String text) throws HeadlessException
  • public TextField(String text, int columns) throws HeadlessException
  • public void setText(String t)

2 接口

Class TextField

public class TextField extends TextComponent

java.lang.Object 
        java.awt.Component 
                java.awt.TextComponent 
                        java.awt.TextField 

• Constructor Detail
  • public TextField() throws HeadlessException
  • public TextField(String text) throws HeadlessException
  • public TextField(int columns) throws HeadlessException
  • public TextField(String text, int columns) throws HeadlessException
• Method Detail
  • public void addNotify()
  • public char getEchoChar()
  • public void setEchoChar(char c)
  • public void setText(String t)
  • public boolean echoCharIsSet()
  • public int getColumns()
  • public void setColumns(int columns)
  • public Dimension getPreferredSize(int columns)
  • public Dimension getPreferredSize()
  • public Dimension getMinimumSize(int columns)
  • public Dimension getMinimumSize()
  • public void addActionListener(ActionListener l)
  • public void removeActionListener(ActionListener l)
  • public ActionListener[] getActionListeners()
  • public T[] getListeners(Class listenerType)
  • protected void processEvent(AWTEvent e)
  • protected void processActionEvent(ActionEvent e)
  • protected String paramString()
  • public AccessibleContext getAccessibleContext()

3 示例代码

import java.awt.*;

public class Test {
    public static void main(String[] args) {
        Frame frame = new Frame("TextField Demo");

        TextField tf = new TextField("hello",10);

        frame.add(tf);

        frame.setBounds(100,100,300,300);

        frame.setVisible(true);
    }
}

4 参考资料