按钮大小和位置

Question

嗨，我想把按钮放在南位置！我怎样才能做到这一点？这是我的代码：

import javax.swing.Icon;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.AbstractTableModel;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.io.*;
import java.util.*;
import javax.swing.JButton;

public class TableDemo extends JPanel {
    private static Icon leftButtonIcon;
    private boolean DEBUG = false;
     // added static infront becuase got non static referencing error
static List<String[]> rosterList = new ArrayList<String[]>();

    public TableDemo() {
        super(new GridLayout(1,0));

        JTable table = new JTable(new MyTableModel());
        table.setPreferredScrollableViewportSize(new Dimension(500, 70));
        table.setFillsViewportHeight(true);

       JButton button=new JButton("Buy it");
       button.setSize(30,60);
        button.add(button);

        //Create the scroll pane and add the table to it.
        JScrollPane scrollPane = new JScrollPane(table);

        //Add the scroll pane to this panel.
        add(scrollPane);
         //create a button

    }

    class MyTableModel extends AbstractTableModel {
        private String[] columnNames = { "Κωδικός", "Ποσότητα", "Τιμή", "Περιγραφή", "Μέγεθος", "Ράτσα"};

        public int getColumnCount() {
            return columnNames.length;
        }

        public int getRowCount() {
            return rosterList.size();
        }

        @Override
        public String getColumnName(int col) {
            return columnNames[col];
        }

     public Object getValueAt(int row, int col)
        {
            return rosterList.get(row)[col];

        }


    }


    private static void createAndShowGUI() {
        //Create and set up the window.

        JFrame frame = new JFrame("TableDemo");

        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);


        //Create and set up the content pane.
        TableDemo newContentPane = new TableDemo();
        newContentPane.setOpaque(true); //content panes must be opaque
        frame.setContentPane(newContentPane);


        //Display the window.
        frame.pack();
        frame.setVisible(true);
    }

Answer 1

试试这个：

JFrame frame = new JFrame();
frame.add(yourbutton,BORDERLAYOUT.SOUTH)

为了给按钮提供位置和大小，请执行以下操作

yourbutton.setBounds(10,15,120,200) --> (x,y,height,width) , x , y set possition

Answer 2

像这样的东西吗？

查看代码中的注释。

import javax.swing.Icon;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.AbstractTableModel;
import javax.swing.border.EmptyBorder;
import java.awt.Dimension;
import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.io.*;
import java.util.*;
import javax.swing.JButton;

public class TableDemo extends JPanel {    
    private static Icon leftButtonIcon;
    private boolean DEBUG = false;
     // added static infront becuase got non static referencing error
static List<String[]> rosterList = new ArrayList<String[]>();

    public TableDemo() {
        super(new BorderLayout(3,3));

        JTable table = new JTable(new MyTableModel());
        table.setPreferredScrollableViewportSize(new Dimension(500, 70));
        table.setFillsViewportHeight(true);

       JButton button=new JButton("Buy it");
       // Rarely has the intended effect.
       // also best not to presume we can guess the size
       // a component needs to be.
       //button.setSize(30,60);
       // cannot add a button to itself!
        //button.add(button);
        JPanel buttonCenter = new JPanel( new FlowLayout(FlowLayout.CENTER) );
        // allow the button to be centered in buttonCenter,
        // rather than stretch across the width of the SOUTH
        // of the TableDemo
        buttonCenter.add(button);
        add(buttonCenter, BorderLayout.SOUTH);

        //Create the scroll pane and add the table to it.
        JScrollPane scrollPane = new JScrollPane(table);

        //Add the scroll pane to this panel.
        add(scrollPane, BorderLayout.CENTER);
         //create a button

        // add a nice border
        setBorder(new EmptyBorder(5,5,5,5));
    }

    class MyTableModel extends AbstractTableModel {
        // apologies about the column names
        private String[] columnNames = { "??d????", "??s?t?ta", "??µ?", "?e????af?", "???e???", "??tsa"};

        public int getColumnCount() {
            return columnNames.length;
        }

        public int getRowCount() {
            return rosterList.size();
        }

        @Override
        public String getColumnName(int col) {
            return columnNames[col];
        }

     public Object getValueAt(int row, int col)
        {
            return rosterList.get(row)[col];

        }
    }


    private static void createAndShowGUI() {
        //Create and set up the window.
        JFrame frame = new JFrame("TableDemo");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        //Create and set up the content pane.
        TableDemo newContentPane = new TableDemo();
        // JPanels are opaque by default!
        //newContentPane.setOpaque(true); //content panes must be opaque
        frame.setContentPane(newContentPane);

        //Display the window.
        frame.pack();
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        // Should be done on the EDT.
        // Left as an exercise for the reader.
        TableDemo.createAndShowGUI();
    }
}

Answer 3

您将按钮添加到自身，并且应该使用 BorderLayout< /a>，如果您想将组件放置在中心/北/南/等方式：

setLayout(new BorderLayout());
add(scrollPane, BorderLayout.CENTER);
add(button, BorderLayout.SOUTH);

Answer 4

“嗨，我想把按钮放在南边位置！我该怎么做？”

如果你想在 BorderLayout 位置放置一些东西，那么让容器使用 ... BorderLayout 是有意义的，这不是吗？

但说真的，您最近在这个论坛上提出的大多数问题都表明您在阅读教程之前先来这里。您已经多次收到这些链接，所以请帮自己一个忙，正确学习 Swing——学习布局教程和其他教程，这样您就会避免很多悲伤和猜测。