我想在Java中使用JScrollPane组件

Question

嗨，大家好，我希望您能帮助我在JScrollPane上显示并行数组。这些数组是String和double数据类型。这里是我的示例代码：String [] items = {“fish”，“frog”};双[]价格= {12,19};我应该把它们放在JScrollPane上，其中位于物品数组0位置的元素位于价格位置0旁边，依此类推;

Answer 1

您无法将数据放入JTable并将表格添加到滚动窗格的任何原因？

import static com.google.common.base.Preconditions.checkArgument; 
import static com.google.common.base.Preconditions.checkNotNull; 

import javax.swing.JFrame; 
import javax.swing.JScrollPane; 
import javax.swing.JTable; 
import javax.swing.SwingUtilities; 
import javax.swing.table.AbstractTableModel; 

class ItemTableModel extends AbstractTableModel { 

    final String[] items; 

    final double[] prices; 

    public ItemTableModel(String[] items, double[] prices) { 
     checkNotNull(items); 
     checkNotNull(prices); 
     checkArgument(items.length == prices.length); 
     this.items = items; 
     this.prices = prices; 
    } 

    @Override 
    public int getRowCount() { 
     return items.length; 
    } 

    @Override 
    public int getColumnCount() { 
     return 2; 
    } 

    @Override 
    public Object getValueAt(int rowIndex, int columnIndex) { 
     switch (columnIndex) { 
     case 0: 
      return items[rowIndex]; 
     case 1: 
      return prices[rowIndex]; 
     default: 
      throw new IllegalArgumentException(); 
     } 

    } 

    @Override 
    public Class<?> getColumnClass(int columnIndex) { 
     switch (columnIndex) { 
     case 0: 
      return String.class; 
     case 1: 
      return Object.class; 
     default: 
      throw new IllegalArgumentException(); 
     } 
    } 

    @Override 
    public String getColumnName(int columnIndex) { 
     switch (columnIndex) { 
     case 0: 
      return "Item"; 
     case 1: 
      return "Price"; 
     default: 
      throw new IllegalArgumentException(); 
     }  
    } 
} 

public class Example { 

    public static void main(String[] args) { 
     Runnable createAndShowGui = new Runnable() { 
      @Override 
      public void run() { 
       createAndShowGui(); 
      } 

     }; 
     SwingUtilities.invokeLater(createAndShowGui); 
    } 


    private static void createAndShowGui() { 
     String[] items = { "fish", "frog" }; 
     double[] prices = { 12, 19 };  
     JFrame frame = new JFrame(); 
     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     frame.setLocationRelativeTo(null); 
     ItemTableModel tableModel = new ItemTableModel(items, prices); 
     JTable table = new JTable(tableModel); 
     //table.setTableHeader(null); // uncomment to hide the table header 
     frame.setContentPane(new JScrollPane(table)); 
     frame.pack(); 
     frame.setVisible(true); 
    } 
}