使用字符串列表作爲組合框的來源

Question

我想在Java的jComboBox中使用一個字符串列表作爲各種選項的來源。你可以告訴使用哪種方法

感謝

Answer 1

這裏有從字符串數組創建組合框代碼，所有你需要做的是改變你的列表中的數組。 String petStrings = ...;

//Create the combo box, select item at index 4. 
//Indices start at 0, so 4 specifies the pig. 
JComboBox petList = new JComboBox(petStrings.toArray()); 

Answer 2

延伸DefaultComboboxModel並創建一個方法，該方法需要一個集合並設置該集合中的項目。使用setModel()將此自定義模型設置爲組合框的模型。

Answer 3

查看下面的我的答案......考慮到這是未經測試的，僅僅是一個例子。

您需要創建的ComboBoxModel的自定義implmentation像Chandru說， 然後使用setModel()方法設置的ComboBoxModel您的JComboBox使用((CustomComboBoxModel<String>)jComboBox.getModel()).add(listOfThings); 事情是這樣的添加元素：

import java.util.List; 
import javax.swing.ComboBoxModel; 

/** 
* Custom Implementation of {@code ComboBoxModel} to allow adding a list of 
* elements to the list. 
*/ 
public interface CustomComboBoxModel<T> extends ComboBoxModel { 

    void add(List<T> elementsToAdd); 

    List<T> getElements(); 

} 

，然後實現接口使用這樣的事情：

import java.util.ArrayList; 
import java.util.List; 
import javax.swing.AbstractListModel; 

/** 
* Default Implementation of CustomComboBoxModel - untested. 
*/ 
public class DefaultCustomComboBoxModel<T> extends AbstractListModel implements CustomComboBoxModel<T> { 

    List<T> objects; 
    T selectedObject; 

    /** 
    * Constructs an empty DefaultCustomComboBoxModel object. 
    */ 
    public DefaultCustomComboBoxModel() { 
     objects = new ArrayList<T>(); 
    } 

    /** 
    * Constructs a DefaultCustomComboBoxModel object initialized with 
    * an array of objects. 
    * 
    * @param items an array of Object objects 
    */ 
    public DefaultCustomComboBoxModel(final T items[]) { 
     objects = new ArrayList<T>(); 

     int i, c; 
     for (i = 0, c = items.length; i < c; i++) { 
      objects.add(items[i]); 
     } 

     if (getSize() > 0) { 
      selectedObject = objects.get(0); 
     } 
    } 

    // implements javax.swing.ComboBoxModel 
    /** 
    * Set the value of the selected item. The selected item may be null. 
    * Make sure {@code anObject} is an instance of T otherwise a 
    * ClassCastException will be thrown. 
    * <p> 
    * @param anObject The combo box value or null for no selection. 
    */ 
    @Override 
    public void setSelectedItem(Object anObject) { 
     if ((selectedObject != null && !selectedObject.equals(anObject)) 
       || selectedObject == null && anObject != null) { 
      selectedObject = (T) anObject; 
      fireContentsChanged(this, -1, -1); 
     } 
    } 

    // implements javax.swing.ComboBoxModel 
    @Override 
    public T getSelectedItem() { 
     return selectedObject; 
    } 

    // implements javax.swing.ListModel 
    @Override 
    public int getSize() { 
     return objects.size(); 
    } 

    // implements javax.swing.ListModel 
    @Override 
    public T getElementAt(int index) { 
     if (index >= 0 && index < objects.size()) { 
      return objects.get(index); 
     } else { 
      return null; 
     } 
    } 

    /** 
    * Returns the index-position of the specified object in the list. 
    * 
    * @param anObject 
    * @return an int representing the index position, where 0 is 
    *   the first position 
    */ 
    public int getIndexOf(T anObject) { 
     return objects.indexOf(anObject); 
    } 

    // implements javax.swing.MutableComboBoxModel 
    public void addElement(T anObject) { 
     objects.add(anObject); 
     fireIntervalAdded(this, objects.size() - 1, objects.size() - 1); 
     if (objects.size() == 1 && selectedObject == null && anObject != null) { 
      setSelectedItem(anObject); 
     } 
    } 

    // implements javax.swing.MutableComboBoxModel 
    public void insertElementAt(T anObject, int index) { 
     objects.add(index, anObject); 
     fireIntervalAdded(this, index, index); 
    } 

    // implements javax.swing.MutableComboBoxModel 
    public void removeElementAt(int index) { 
     if (getElementAt(index) == selectedObject) { 
      if (index == 0) { 
       setSelectedItem(getSize() == 1 ? null : getElementAt(index + 1)); 
      } else { 
       setSelectedItem(getElementAt(index - 1)); 
      } 
     } 

     objects.remove(index); 

     fireIntervalRemoved(this, index, index); 
    } 

    // implements javax.swing.MutableComboBoxModel 
    public void removeElement(T anObject) { 
     int index = objects.indexOf(anObject); 
     if (index != -1) { 
      removeElementAt(index); 
     } 
    } 

    /** 
    * Empties the list. 
    */ 
    public void removeAllElements() { 
     if (objects.size() > 0) { 
      int firstIndex = 0; 
      int lastIndex = objects.size() - 1; 
      objects.clear(); 
      selectedObject = null; 
      fireIntervalRemoved(this, firstIndex, lastIndex); 
     } else { 
      selectedObject = null; 
     } 
    } 

    @Override 
    public void add(List<T> elementsToAdd) { 
     objects.addAll(elementsToAdd); 
     fireContentsChanged(this, -1, -1); 

    } 

    @Override 
    public List<T> getElements() { 
     return objects; 
    } 
} 

Answer 4

最簡單的方法是：

comboBox.setModel(new DefaultComboBoxModel(list.toArray())); 

Answer 5

我知道這是一箇舊帖子，但我想對edwardsmatt的DefaultCustomComboBoxModel做一個小的補充。不要忘了添加這個構造函數：

public DefaultCustomComboBoxModel(List<T> list) { 
    objects = list; 

    if (getSize() > 0) { 
     selectedObject = objects.get(0); 
    } 
} 

這樣模型也可以用列表來初始化，

myCombo.setModel(new DefaultCustomComboBoxModel(myList)); 

如果您使用((CustomComboBoxModel)myCombo.getModel()).add(myList)您需要明確設置所選項目。

Answer 6

你也可以做這樣的：

DefaultTableModel modelTabele = (DefaultTableModel) tblOsobe.getModel(); 
    modelTabele.addColumn("Ime"); 
    modelTabele.addColumn("Prezime"); 
    modelTabele.addColumn("Datum Rodjenja"); 

    for (Osoba osoba : Liste.osobe) { 
     System.out.println("" + osoba); 
     Object[] podaci = new Object[3]; 
     podaci[0] = osoba.getIme(); 
     podaci[1] = osoba.getPrezime(); 
     podaci[2] = osoba.getDatumRodjenja(); 
     modelTabele.addRow(podaci); 

    } 

這種模式有3列和多行，因爲在字符串Liste.osobe名單。