Solution for Exceptions 03

.devcontainer.json

@@ -0,0 +1,3 @@
+{
+    "image": "mcr.microsoft.com/devcontainers/java:21"
+}

.vscode/extensions.json

@@ -0,0 +1,5 @@
+{
+    "recommendations": [
+        "vscjava.vscode-java-pack"
+    ]
+}

Employee.java

@@ -22,7 +22,17 @@ public int getSalaryInEuro() {
     return salaryInEuro;
   }
 
-  public void setSalaryInEuro(int salaryInEuro) {
+  public void setSalaryInEuro(int salaryInEuro)
+      throws SalaryDecreaseException, SalaryIncreaseTooHighException {
+    if (this.salaryInEuro > salaryInEuro) {
+      throw new SalaryDecreaseException();
+    }
+
+    double change = (double) (salaryInEuro - this.salaryInEuro) / this.salaryInEuro;
+    if (change > 0.1) {
+      throw new SalaryIncreaseTooHighException();
+    }
+
     this.salaryInEuro = salaryInEuro;
   }
 

Exercise.java

@@ -17,6 +17,39 @@ public static void main(String[] args) {
     company.addEmployee(new Employee(4, new Person("Peter Schneider"), 55000));
     company.addEmployee(new Employee(5, new Person("Miriam Albers"), 90000));
 
+    try {
+      e1.setSalaryInEuro(55000);
+      e2.setSalaryInEuro(77000);
+      e3.setSalaryInEuro(45000);
+    } catch (SalaryDecreaseException | SalaryIncreaseTooHighException e) {
+      System.err.println(e.getMessage());
+    }
+
+    // alternative multiple catch:
+    try {
+      e1.setSalaryInEuro(55000);
+      e2.setSalaryInEuro(77000);
+      e3.setSalaryInEuro(45000);
+    } catch (SalaryDecreaseException e) {
+      System.out.println(e.getMessage());
+    } catch (SalaryIncreaseTooHighException e) {
+      System.out.println(e.getMessage());
+    }
+
+    // alternative instance of
+    try {
+      e1.setSalaryInEuro(55000);
+      e2.setSalaryInEuro(77000);
+      e3.setSalaryInEuro(45000);
+    } catch (Exception e) {
+      if (e instanceof SalaryDecreaseException) {
+        System.out.println(e.getMessage());
+      }
+      if (e instanceof SalaryIncreaseTooHighException) {
+        System.out.println(e.getMessage());
+      }
+    }
+
     System.out.println(company.toString());
   }
 }

SalaryDecreaseException.java

@@ -0,0 +1,7 @@
+public class SalaryDecreaseException extends Exception {
+
+  public SalaryDecreaseException() {
+    super("Das neue Gehalt muss hoeher sein als das bisherige");
+    // alternativ: super();
+  }
+}

SalaryIncreaseTooHighException.java

@@ -0,0 +1,7 @@
+public class SalaryIncreaseTooHighException extends Exception {
+
+  public SalaryIncreaseTooHighException() {
+    super("Das neue Gehalt darf maximal 10% ueber dem bisherigen Gehalt liegen");
+    // alternativ: super();
+  }
+}