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Java: Use Key/Value Pair For JComboBox Like HTML’s Select Tag

By default, Java’s JComboBox does not have the same feature as the HTML dropdown’s SELECT tag. You know the label and value in the OPTION tag. If you want to have the same feature for the JComboBox, you would have to ceate your own KeyValue class that contains the key (label) and the value. See the code below.

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public class KeyValue {
	String key, value;
 
	public KeyValue(String key, String value) {
		this.key = key;
		this.value = value;
	}
 
	public String getValue() { return value; }
	public String getKey() { return key; }
 
	@Override
	public String toString() { return key; }
 
	@Override
	public boolean equals(Object obj) {
		if (obj instanceof KeyValue) {
			KeyValue kv = (KeyValue) obj;
			return (kv.value.equals(this.value));
		}
		return false;
	}
 
	@Override
	public int hashCode() {
		int hash = 7;
		hash = 97 * hash + (this.value != null ? this.value.hashCode() : 0);
		return hash;
	}
}

Make sure the toString() method returns the variable key so that it will be what will appear in the JComboBox’s list. To add it to the JComboBox, do it like this.

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jComboBox1.addItem(new KeyValue("label", "value"));

To get the selected item, do this.

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String value = ((KeyValue) jComboBox2.getSelectedItem()).getValue();