Framesize issue while minimising and maximising java swing -

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i have set frame size of java swing application to: frame.setsize(700, 500);

whenever maximise window, want ui elements adjust , take full application size. right when maximise, frame occupying full window remains blank, ui elements remain @ same position before. how should change code whenever maximise window, ui elements should occupy window ?

this sample code can app, gridbagconstraint work re size need set weightx or weighty property non zero.

import java.awt.*; import javax.swing.*;  public class app extends jframe{   public app(string title){     super(title);      gridbaglayout layout = new gridbaglayout();     gridbagconstraints constraints = new gridbagconstraints();     getcontentpane().setlayout(layout);     constraints.anchor = gridbagconstraints.west;     jlabel l1 = new jlabel("first name:");     constraints.gridx = 0;     constraints.gridy = 0;     constraints.gridwidth = 1;     constraints.gridheight = 1;     constraints.weightx = 0;     constraints.weighty = 0;     constraints.fill = gridbagconstraints.both;     constraints.insets = new insets(5,5,5,5);         layout.setconstraints(l1, constraints);     getcontentpane().add(l1);      //jtextfield t1 = new jtextfield(10);     jtextfield t1 = new jtextfield(); //removed passing column size.     constraints.gridx = 1;     constraints.gridy = 0;     constraints.weightx = 1;     constraints.fill = gridbagconstraints.horizontal;     constraints.insets = new insets(5,5,5,5);     layout.setconstraints(t1, constraints);     getcontentpane().add(t1);       setdefaultcloseoperation(exit_on_close);     setsize(700,500);   }   public static void main(string[] args){     new app("app").setvisible(true);   } }

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