public class Swapping{
  static void swap(int i,int j){
  int temp=i;
  i=j;
  j=temp;
  System.out.println("After swapping i = " + i + " j = " + j);
  }
  public static void main(String[] args){
  int i=1;
  int j=2;

  System.out.prinln("Before swapping i="+i+" j="+j);
  swap(i,j);

  }
}

In the above code, the values of i and j are function arguments.

import java.sql.*;
import java.awt.*;
import java.util.*;
import javax.swing.*;
import java.awt.event.*;
class  JComboBoxJTable{

    public static void main(String[] args) throws Exception{
        JFrame f=new JFrame();
        f.setLayout(null);
        JLabel lab=new JLabel("Select");
        final JComboBox combo=new JComboBox();
        combo.addItem("--Select--");
        Class.forName("com.mysql.jdbc.Driver");
           Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root", "root");
           final Statement st=con.createStatement();
           ResultSet rs=st.executeQuery("select * from employee");

           while(rs.next()){
           combo.addItem(rs.getString("name"));
           }

        ActionListener actionListener = new ActionListener() {
      public void actionPerformed(ActionEvent actionEvent) {
        ItemSelectable is = (ItemSelectable)actionEvent.getSource();
        String nn=selectedString(is);
        System.out.println("Selected: " + nn);
        }
    };
       combo.addActionListener(actionListener);
        lab.setBounds(20,20,100,20);
        combo.setBounds(120,20,80,20);
        f.add(lab);
        f.add(combo);

        f.setVisible(true);
        f.setSize(300,120);
    }
    static private String selectedString(ItemSelectable is) {
    Object selected[] = is.getSelectedObjects();
    return ((selected.length == 0) ? "null" : (String)selected[0]);
  } 
}