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SimpleCalculator3.java

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//for example

import javax.swing.*;

import java.awt.GridBagConstraints;

import java.awt.GridBagLayout;

public class SimpleCalculator3 {

public static void main(String[] args) {

// set GridBagLayout for window panel

GridBagLayout gb = new GridBagLayout();

this.setLayout(gb);

// create an instanse of the class GridBagConstraints

// these lines of code need to be repeated for each component that is added to

// the cell

GridBagConstraints constr = new GridBagConstraints();

// set restrictions for the input iine of the calculator coordinate x in the

// table

constr.x = 0;

// coordinate y in the table

constr.y = 0;

// the cell has the same height as a standard cell

constr.gridheight = 1;

// the cell has a width equal to the width of 6 standard cells

constr.gridwidth = 6;

// fill the entire cell space

constr.fill = constr.BOTH;

// the horizontal proportion that the component will occupy

constr.weightx = 1.0;

// the vertical proportion that the component will occupy

constr.weighty = 1.0;

// position of the component within the cell

constr.anchor = constr.CENTER;

displayField = new JTextField();

// set restrictions for the input field

gb.setConstraints(displayField, constr);

// add the input field to the window

windowContent.add(displayField);

}

}