Java GridLayout

The Java GridLayout class is used to arrange the components in a rectangular grid. One component is displayed in each rectangle.

Constructors of GridLayout class

GridLayout(): creates a grid layout with one column per component in a row.
GridLayout(int rows, int columns): creates a grid layout with the given rows and columns but no gaps between the components.
GridLayout(int rows, int columns, int hgap, int vgap): creates a grid layout with the given rows and columns along with given horizontal and vertical gaps.

Example of GridLayout class: Using GridLayout() Constructor

The GridLayout() constructor creates only one row. The following example shows the usage of the parameterless constructor.

FileName: GridLayoutExample.java

// import statements
import java.awt.*;  
import javax.swing.*;  
  
public class GridLayoutExample
{  
JFrame frameObj;  

// constructor
GridLayoutExample()
{  
frameObj = new JFrame();  

// creating 9 buttons
JButton btn1 = new JButton("1");  
JButton btn2 = new JButton("2");  
JButton btn3 = new JButton("3");  
JButton btn4 = new JButton("4");  
JButton btn5 = new JButton("5");  
JButton btn6 = new JButton("6");  
JButton btn7 = new JButton("7");  
JButton btn8 = new JButton("8");  
JButton btn9 = new JButton("9");  
  
// adding buttons to the frame
// since, we are using the parameterless constructor, therfore; 
// the number of columns is equal to the number of buttons we 
// are adding to the frame. The row count remains one.
frameObj.add(btn1); frameObj.add(btn2); frameObj.add(btn3);
frameObj.add(btn4); frameObj.add(btn5); frameObj.add(btn6);
frameObj.add(btn7); frameObj.add(btn8); frameObj.add(btn9);  

// setting the grid layout using the parameterless constructor  
frameObj.setLayout(new GridLayout());  


frameObj.setSize(300, 300);  
frameObj.setVisible(true);  
}

// main method
public static void main(String argvs[]) 
{  
new GridLayoutExample();  
}  
}  

Output:

Example of GridLayout class: Using GridLayout(int rows, int columns) Constructor

FileName: MyGridLayout.java

import java.awt.*;  
import javax.swing.*;  
public class MyGridLayout{  
JFrame f;  
MyGridLayout(){  
    f=new JFrame();  
    JButton b1=new JButton("1");  
    JButton b2=new JButton("2");  
    JButton b3=new JButton("3");  
    JButton b4=new JButton("4");  
    JButton b5=new JButton("5");  
    JButton b6=new JButton("6");  
    JButton b7=new JButton("7");  
    JButton b8=new JButton("8");  
    JButton b9=new JButton("9");  
     // adding buttons to the frame     
    f.add(b1); f.add(b2); f.add(b3);
    f.add(b4); f.add(b5); f.add(b6);
    f.add(b7); f.add(b8); f.add(b9);  

    // setting grid layout of 3 rows and 3 columns  
    f.setLayout(new GridLayout(3,3));  
    f.setSize(300,300);  
    f.setVisible(true);  
}  
public static void main(String[] args) {  
    new MyGridLayout();  
}  
}  

Output:

download this example

Example of GridLayout class: Using GridLayout(int rows, int columns, int hgap, int vgap) Constructor

The following example inserts horizontal and vertical gaps between buttons using the parameterized constructor GridLayout(int rows, int columns, int hgap, int vgap).

FileName: GridLayoutExample1.java

// import statements
import java.awt.*;  
import javax.swing.*;  
  
public class GridLayoutExample1
{  

JFrame frameObj;  

// constructor
GridLayoutExample1()
{  
frameObj = new JFrame();  

// creating 9 buttons
JButton btn1 = new JButton("1");  
JButton btn2 = new JButton("2");  
JButton btn3 = new JButton("3");  
JButton btn4 = new JButton("4");  
JButton btn5 = new JButton("5");  
JButton btn6 = new JButton("6");  
JButton btn7 = new JButton("7");  
JButton btn8 = new JButton("8");  
JButton btn9 = new JButton("9");  
  
// adding buttons to the frame
// since, we are using the parameterless constructor, therefore; 
// the number of columns is equal to the number of buttons we 
// are adding to the frame. The row count remains one.
frameObj.add(btn1); frameObj.add(btn2); frameObj.add(btn3);
frameObj.add(btn4); frameObj.add(btn5); frameObj.add(btn6);
frameObj.add(btn7); frameObj.add(btn8); frameObj.add(btn9);  
// setting the grid layout 
// a 3 * 3 grid is created with the horizontal gap 20 
// and vertical gap 25
frameObj.setLayout(new GridLayout(3, 3, 20, 25));  
frameObj.setSize(300, 300);  
frameObj.setVisible(true);  
}
// main method
public static void main(String argvs[]) 
{  
new GridLayoutExample();  
}  
}  

Output: