UC知道关于JAVA实例方法问题
来源：百度知道 编辑：UC知道 时间：2024/06/26 05:02:49
import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.JFrame;
import java.awt.FlowLayout;
public class ShowFlowLayout extends JFrame {
public ShowFlowLayout() {
// Set FlowLayout, aligned left with horizontal gap 10
// and vertical gap 20 between components
setLayout(new FlowLayout(FlowLayout.LEFT, 10, 20));
// Add labels and text fields to the frame
add(new JLabel("First Name"));
add(new JTextField(8));
add(new JLabel("MI"));
add(new JTextField(1));
add(new JLabel("Last Name"));
add(new JTextField(8));
}
/** Main method */
public static void main(String[] args) {
ShowFlowLayout frame = new ShowFlowLayout();
frame.setTitle("ShowFlowLayout");
frame.setLocationRelativeTo(null); // New since JDK 1.4
frame.setDefaultCloseOperation(JFrame.E
import javax.swing.JTextField;
import javax.swing.JFrame;
import java.awt.FlowLayout;
public class ShowFlowLayout extends JFrame {
public ShowFlowLayout() {
// Set FlowLayout, aligned left with horizontal gap 10
// and vertical gap 20 between components
setLayout(new FlowLayout(FlowLayout.LEFT, 10, 20));
// Add labels and text fields to the frame
add(new JLabel("First Name"));
add(new JTextField(8));
add(new JLabel("MI"));
add(new JTextField(1));
add(new JLabel("Last Name"));
add(new JTextField(8));
}
/** Main method */
public static void main(String[] args) {
ShowFlowLayout frame = new ShowFlowLayout();
frame.setTitle("ShowFlowLayout");
frame.setLocationRelativeTo(null); // New since JDK 1.4
frame.setDefaultCloseOperation(JFrame.E
add是JFrame的静态函数，在JFrame或他的子类中，可以直接用add，这与JFrame.add，this.add作用一样。
咳咳，这是瞎扯，JFrame的add是集成父类java.awt.Container的，由于是public修饰的，ShowFlowLayout又是JFrame的子类，所以可以直接用。只不过省略一个this而已。
add是一个静态的库函数！就可以不直接被引用！
add来至于基类JFrame可以直接使用.这有什么问题?