Question

pts Which layout manager constructor call would be best-suited to create a telephone keypad GUI which has three rows of three keys that are labeled 1,2,3; 4,5,6; and 7,8,9; respectively, as well as a fourth row of three keys labeled 0, #? new GridLayout(3, 4) new GridLayout(4, 3) new FlowLayout(4, 3) new BorderLayout(3, 4)

Answer 1

import java.awt.*;  
import javax.swing.*;  

public class TestLayout
{  
    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");  
    JButton bs=new JButton("*");  
    JButton b0=new JButton("0");  
    JButton bh=new JButton("#");  

    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);f.add(bs);  
    f.add(b0);f.add(bh);    

    f.setLayout(new GridLayout(4,3));  
    //setting grid layout of 4 rows and 3 columns  

    f.setSize(300,300);  
    f.setVisible(true);  
    }  
    public static void main(String[] args) 
    {  
        new TestLayout();  
    }  
}  

The output is

х 1 2 3 4 5 6 7 8 9 0 #

Grid Layout creates a rectangular grid of specified rows and columns.

So, the answer is

new GridLayout(4, 3)