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Libraries In Java
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Libraries In Java
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Java.swing:
eg:
import javax.swing.*;
public class FirstSwingExample {
public static void main(String[] args) {
JFrame f=new JFrame();//creating instance of JFrame
JButton b=new JButton("click");//creating instance of JButton
b.setBounds(130,100,100, 40);//x axis, y axis, width, height
f.add(b);//adding button in JFrame
f.setSize(400,500);//400 width and 500 height
f.setLayout(null);//using no layout managers
f.setVisible(true);//making the frame visible
}
}
Java.math:
eg:
package MathFunctions;
public class AbsMethod {
public static void main(String[] args) {
double b = 10.9666, c = -14.9865;
float d = 1.23f, e = 4.809f;
long f = 200, g = -400;
System.out.println("Absolute value of Positive Integer: " + Math.abs(60));
System.out.println("Absolute value of Negative Integer: " + Math.abs(-20));
System.out.println("\nAbsolute value of Positive Double: " + Math.abs(b));
System.out.println("Absolute value of Negative Double: " + Math.abs(c));
System.out.println("\nAbsolute value of Positive Float: " + Math.abs(d));
System.out.println("Absolute value of Negative Float: " + Math.abs(e));
System.out.println("\nAbsolute value of Positive Number: " + Math.abs(f));
System.out.println("Absolute value of Negative Number: " + Math.abs(g));
}
}
Java.net:
eg:
import java.net.*;
import java.io.*;
public class Client
{
private Socket socket = null;
private DataInputStream input = null;
private DataOutputStream out = null;
public Client(String address, int port)
{
try
{
socket = new Socket(address, port);
System.out.println("Connected");
input = new DataInputStream(System.in);
out = new DataOutputStream(socket.getOutputStream());
}
catch(UnknownHostException u)
{
System.out.println(u);
}
catch(IOException i)
{
System.out.println(i);
}
String line = "";
while (!line.equals("Over"))
{
try
{
line = input.readLine();
out.writeUTF(line);
}
catch(IOException i)
{
System.out.println(i);
}
}
// close the connection
try
{
input.close();
out.close();
socket.close();
}
catch(IOException i)
{
System.out.println(i);
}
}
public static void main(String args[])
{
Client client = new Client("127.0.0.1", 5000);
}
}
Java.sql:
eg:
import java.sql.*;
class MysqlCon{
public static void main(String args[]){
try{
Class.forName("com.mysql.jdbc.Driver");
Connection con=DriverManager.getConnection(
"jdbc:mysql://localhost:3306/sonoo","root","root");
Statement stmt=con.createStatement();
ResultSet rs=stmt.executeQuery("select * from emp");
while(rs.next())
System.out.println(rs.getInt(1)+" "+rs.getString(2)+" "+rs.getString(3));
con.close();
}catch(Exception e){ System.out.println(e);}
}
}