Help to improve java swing calculator made on eclipse

.classpath

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+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="src" path="src"/>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8"/>
+	<classpathentry kind="output" path="bin"/>
+</classpath>

.project

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+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>GUICalc</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+	</natures>
+</projectDescription>

.settings/org.eclipse.jdt.core.prefs

@@ -0,0 +1,11 @@
+eclipse.preferences.version=1
+org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.8
+org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
+org.eclipse.jdt.core.compiler.compliance=1.8
+org.eclipse.jdt.core.compiler.debug.lineNumber=generate
+org.eclipse.jdt.core.compiler.debug.localVariable=generate
+org.eclipse.jdt.core.compiler.debug.sourceFile=generate
+org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
+org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
+org.eclipse.jdt.core.compiler.source=1.8

src/Calculator.java

@@ -0,0 +1,170 @@
+import java.awt.EventQueue;
+
+import javax.swing.JFrame;
+import javax.swing.JButton;
+import java.awt.event.ActionListener;
+import java.awt.event.ActionEvent;
+import javax.swing.JLabel;
+import javax.swing.SwingConstants;
+import java.awt.Font;
+import javax.swing.JTextField;
+import java.awt.Color;
+
+public class Calculator {
+
+	private JFrame frmCalculator;
+
+	/**
+	 * Launch the application.
+	 */
+	public static void main(String[] args) {
+		EventQueue.invokeLater(new Runnable() {
+			public void run() {
+				try {
+					Calculator window = new Calculator();
+					
+					window.frmCalculator.setVisible(true);
+					
+				} catch (Exception e) {
+					e.printStackTrace();
+				}
+			}
+		});
+	}
+
+	/**
+	 * Create the application.
+	 */
+	public Calculator() {
+		initialize();
+	}
+
+	/**
+	 * Initialize the contents of the frame.
+	 */
+	private void initialize() {
+		frmCalculator = new JFrame();
+		frmCalculator.getContentPane().setFont(new Font("Tahoma", Font.PLAIN, 18));
+		frmCalculator.setTitle("Calculator");
+		frmCalculator.setResizable(false);
+		frmCalculator.setBounds(100, 100, 293, 230);
+		frmCalculator.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+		frmCalculator.getContentPane().setLayout(null);
+		JLabel operator = new JLabel("");
+		operator.setFont(new Font("Tahoma", Font.BOLD, 13));
+		operator.setHorizontalAlignment(SwingConstants.CENTER);
+		operator.setBounds(126, 22, 36, 23);
+		frmCalculator.getContentPane().add(operator);
+
+		JLabel answer = new JLabel("");
+		answer.setHorizontalAlignment(SwingConstants.CENTER);
+		answer.setBounds(48, 161, 187, 23);
+		frmCalculator.getContentPane().add(answer);
+		
+		JTextField dtrpnNumber = new JTextField();
+		dtrpnNumber.setFont(new Font("Tahoma", Font.PLAIN, 12));
+		dtrpnNumber.setBounds(10, 22, 106, 23);
+		//Border b = null;
+		//b.paintBorder(dtrpnNumber, null, 0, 0, 1, 1);
+		//dtrpnNumber.setBorder(1);
+		frmCalculator.getContentPane().add(dtrpnNumber);
+
+		JTextField dtrpnNumber_1 = new JTextField();
+		dtrpnNumber_1.setBounds(170, 22, 106, 23);
+		frmCalculator.getContentPane().add(dtrpnNumber_1);
+
+		
+
+		JButton plus = new JButton("+");
+		plus.setBackground(Color.LIGHT_GRAY);
+		plus.setFont(new Font("Tahoma", Font.PLAIN, 18));
+		plus.setIcon(null);
+		plus.addActionListener(new ActionListener() {
+			public void actionPerformed(ActionEvent arg0) {
+				operator.setText("+");
+			}
+		});
+		plus.setBounds(10, 56, 106, 23);
+		frmCalculator.getContentPane().add(plus);
+
+		JButton minus = new JButton("-");
+		minus.setBackground(Color.LIGHT_GRAY);
+		minus.setFont(new Font("Tahoma", Font.PLAIN, 28));
+		minus.addActionListener(new ActionListener() {
+			public void actionPerformed(ActionEvent arg0) {
+				operator.setText("-");
+			}
+		});
+		minus.setBounds(10, 93, 106, 23);
+		frmCalculator.getContentPane().add(minus);
+
+		JButton multiply = new JButton("x");
+		multiply.setBackground(Color.LIGHT_GRAY);
+		multiply.setFont(new Font("Tahoma", Font.PLAIN, 18));
+		multiply.addActionListener(new ActionListener() {
+			public void actionPerformed(ActionEvent arg0) {
+				operator.setText("X");
+			}
+		});
+		multiply.setBounds(170, 56, 106, 23);
+		frmCalculator.getContentPane().add(multiply);
+
+		JButton division = new JButton("/");
+		division.setBackground(Color.LIGHT_GRAY);
+		division.setFont(new Font("Tahoma", Font.PLAIN, 18));
+		division.addActionListener(new ActionListener() {
+			public void actionPerformed(ActionEvent arg0) {
+				operator.setText("/");
+			}
+		});
+		division.setBounds(170, 93, 106, 23);
+		frmCalculator.getContentPane().add(division);
+
+		JButton equal = new JButton("=");
+		equal.setBackground(new Color(192, 192, 192));
+		equal.setFont(new Font("Tahoma", Font.PLAIN, 18));
+		equal.addActionListener(new ActionListener() {
+			public void actionPerformed(ActionEvent e) {
+				if(dtrpnNumber.getText().isEmpty())
+				{
+					dtrpnNumber.setText("0");
+				}
+				if(dtrpnNumber_1.getText().isEmpty())
+				{
+					dtrpnNumber_1.setText("0");
+				}
+				Float ans = new Float(0);
+				if(operator.getText() == "+")
+				{
+					ans= Float.valueOf(dtrpnNumber.getText())+Float.valueOf(dtrpnNumber_1.getText());
+					answer.setText("Answer = "+ans.toString());
+				}
+				else
+					if(operator.getText() == "-")
+					{
+						ans= Float.valueOf(dtrpnNumber.getText())-Float.valueOf(dtrpnNumber_1.getText());
+						answer.setText("Answer = "+ans.toString());
+					}
+					else
+						if(operator.getText() == "X")
+						{
+							ans= Float.valueOf(dtrpnNumber.getText())*Float.valueOf(dtrpnNumber_1.getText());
+							answer.setText("Answer = "+ans.toString());
+						}
+						else
+							if(operator.getText() == "/")
+							{
+								ans= Float.valueOf(dtrpnNumber.getText())/Float.valueOf(dtrpnNumber_1.getText());
+								answer.setText("Answer = "+ans.toString());
+							}
+							else
+								answer.setText("No Operator is Selected!!!");
+
+			}
+		});
+		equal.setBounds(114, 127, 61, 23);
+		frmCalculator.getContentPane().add(equal);
+
+
+	}
+}