Umrechner von Celsius nach Kelvin

src/main/java/src/TasksFrame.java

@@ -69,6 +69,8 @@ public class TasksFrame extends JFrame {
 
         setupDate();
 
+        setupTemperatur();
+
         setupSum();
 
         setupDiff();
@@ -723,9 +725,59 @@ public class TasksFrame extends JFrame {
     public double temperatur(double tem){
         double x=0;
         x = tem + 273.15;
+        x = Math.round(x * 100.0) / 100.0;
         return x;
     }
 
+    private void setupTemperatur()
+    {
+        JPanel jPanel = setupPanel("Temperatur Rechner");
+
+        JTextField a = new JTextField();
+        a.setVisible(true);
+        a.setBounds(10,30,35,30);
+        a.setFont(new java.awt.Font("Arial", Font.BOLD, 12));
+
+        JLabel jLabel = new JLabel();
+        jLabel.setBounds(45,35,20,20);
+        jLabel.setText("°C");
+        jLabel.setVisible(true);
+        jLabel.setFont(new java.awt.Font("Arial", Font.BOLD, 12));
+
+        JButton jButton = new JButton();
+        jButton.setText("Umwandle zum Kelvin");
+        jButton.setBounds(10,60,200,30);
+        jButton.setVisible(true);
+        jButton.setFont(new java.awt.Font("Arial", Font.BOLD, 12));
+
+        JTextField result = new JTextField();
+        result.setBounds(10, 100, 60, 20);
+        result.setVisible(true);
+        result.setFont(new java.awt.Font("Arial", Font.BOLD, 12));
+
+        JLabel k = new JLabel();
+        k.setBounds(70,100,20,20);
+        k.setText("K");
+        k.setFont(new java.awt.Font("Arial", Font.BOLD, 12));
+
+        jButton.addActionListener(new ActionListener() {
+            @Override
+            public void actionPerformed(ActionEvent e) {
+                String texta = a.getText();
+                double val_a = Double.valueOf(texta);
+                double res = temperatur(val_a);
+                result.setText(String.valueOf(res));
+            }
+        });
+
+        jPanel.add(a);
+        jPanel.add(jLabel);
+        jPanel.add(result);
+        jPanel.add(jButton);
+        jPanel.add(k);
+    }
+
+
     public void setupArea()
     {
         JPanel jPanel = setupPanel("Area and perimeter of a Rectangle:");

src/test/java/src/TasksFrameTest.java

@@ -30,11 +30,11 @@ class TasksFrameTest {
     {
         TasksFrame tasksFrame = new TasksFrame();
         double x = tasksFrame.temperatur(-10.6);
-        assertEquals(262.55,x);
+        assertEquals(262.55,x, 0.01);
         double x2 = tasksFrame.temperatur(8.0);
-        assertEquals(281.15,x2);
+        assertEquals(281.15,x2,0.01);
         double x3 = tasksFrame.temperatur(0);
-        assertEquals(273.15,x3);
+        assertEquals(273.15,x3,0.01);
 
     }