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layout

 
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import java.awt.*;
import java.io.*;
public class mframe extends Frame{
Button bn,bs,be,bw,bc;
public mframe(){
super("maha");
Button bn = new Button("North");
Button bs = new Button("South");
Button be = new Button("East");
Button bw = new Button("West");
Button bc = new Button("Center");
setLayout(new FlowLayout());
//add(bn); add(bs); add(be); add(bn); add(bn);}
try{
add("North",bn);
setSize(300,300);
setVisible(true);
System.out.println("Added north and sleepling");
Thread.sleep(2000);
add("East",be);
setSize(300,300);
setVisible(true);
System.out.println("Added East and sleepling"); Thread.sleep(2000);
add("South",bn);
setSize(300,300);
setVisible(true);
System.out.println("Added South and sleepling"); Thread.sleep(2000);
add("West",bw);
setSize(300,300);
setVisible(true);
System.out.println("Added West and sleepling"); Thread.sleep(2000);
add("Center",bc);
setSize(300,300);
setVisible(true);
System.out.println("Added Center and sleepling"); Thread.sleep(2000); }
// catch(InterruptedException e) {}
}
public static void main(String args[]){
new mframe();
} }
import java.awt.*;
import java.io.*;
public class mframe1 extends Frame{
Button bn,bs,be,bw,bc;
public mframe1(){
super("maha");
Button bn = new Button("North");
Button bs = new Button("South");
Button be = new Button("East");
Button bw = new Button("West");
Button bc = new Button("Center");
setLayout(new FlowLayout());
add(bn); add(bs); add(be); add(bn); add(bn);}

public static void main(String args[]){
new mframe1();
} }
/*
here nothing happens untill I store new mframe1() object is frame f object and call f.show().
frame f=new mframe1();
f.show();
please explain it to me.Is it due to layout as in border layout I don't have to add f.show.
*/
jaideep
 
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Hi
Your second code is like this :
public class mframe1 extends Frame{
Button bn,bs,be,bw,bc;
public mframe1(){
super("maha");
Button bn = new Button("North");
Button bs = new Button("South");
Button be = new Button("East");
Button bw = new Button("West");
Button bc = new Button("Center");
setLayout(new FlowLayout());
add(bn); add(bs); add(be); add(bn); add(bn);}
public static void main(String args[]){
new mframe1();
} }
In case of Frame, to display it you have to explicitly call the function to display it. Also you've to call setSize() function to assign it a size.
In the first program You are useing it , thats why it's coming.
Try with this:
import java.awt.*;
import java.io.*;
public class mframe extends Frame{
Button bn,bs,be,bw,bc;
public mframe(){
super("maha");
Button bn = new Button("North");
Button bs = new Button("South");
Button be = new Button("East");
Button bw = new Button("West");
Button bc = new Button("Center");
setLayout(new FlowLayout());
add(bn); add(bs); add(be); add(bn); add(bn);}
public static void main(String args[]){
mframe t = new mframe();
t.setSize(100,100);
t.setVisible(true);
}
}
Hope this helps you
Shikhar
 
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