update exception

src/main/java/com/examplehub/basics/exception/ArithmeticExceptionExample.java

@@ -0,0 +1,4 @@
+package com.examplehub.basics.exception;
+
+public class ArithmeticExceptionExample {
+}

src/main/java/com/examplehub/basics/exception/ClassCastExceptionExample.java

@@ -0,0 +1,4 @@
+package com.examplehub.basics.exception;
+
+public class ClassCastExceptionExample {
+}

src/main/java/com/examplehub/basics/exception/CustomExceptionExample.java

@@ -0,0 +1,15 @@
+package com.examplehub.basics.exception;
+
+public class CustomExceptionExample extends Exception {
+
+//  @java.io.Serial
+  private static final long serialVersionUID = 234122876006267687L;
+
+  public CustomExceptionExample() {
+    super();
+  }
+
+  public CustomExceptionExample(String message) {
+    super(message);
+  }
+}

src/main/java/com/examplehub/basics/exception/FinallyExample.java

@@ -0,0 +1,4 @@
+package com.examplehub.basics.exception;
+
+public class FinallyExample {
+}

src/main/java/com/examplehub/basics/exception/IndexOutOfBoundsExceptionExample.java

@@ -0,0 +1,4 @@
+package com.examplehub.basics.exception;
+
+public class IndexOutOfBoundsExceptionExample {
+}

src/main/java/com/examplehub/basics/exception/NullPointerExceptionExample.java

@@ -0,0 +1,4 @@
+package com.examplehub.basics.exception;
+
+public class NullPointerExceptionExample {
+}

src/main/java/com/examplehub/basics/exception/NumberFormatExceptionExample.java

@@ -0,0 +1,4 @@
+package com.examplehub.basics.exception;
+
+public class NumberFormatExceptionExample {
+}

src/main/java/com/examplehub/basics/exception/ThrowsExceptionExample.java

@@ -0,0 +1,4 @@
+package com.examplehub.basics.exception;
+
+public class ThrowsExceptionExample {
+}

src/test/java/com/examplehub/basics/exception/ArithmeticExceptionExampleTest.java

@@ -0,0 +1,17 @@
+package com.examplehub.basics.exception;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class ArithmeticExceptionExampleTest {
+  @Test
+  void testDivideByZero() {
+    try {
+      int division = 10 / 0;
+      fail();
+    } catch (ArithmeticException e) {
+      assertTrue(true);
+    }
+  }
+}

src/test/java/com/examplehub/basics/exception/ClassCastExceptionExampleTest.java

@@ -0,0 +1,20 @@
+package com.examplehub.basics.exception;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+import java.util.ArrayList;
+import java.util.Arrays;
+
+class ClassCastExceptionExampleTest {
+  @Test
+  void testClassCast() {
+    try {
+      String[] strArray = new String[]{"John", "Snow"};
+      ArrayList<String> strList = (ArrayList<String>) Arrays.asList(strArray);
+      System.out.println("String list: " + strList);
+    } catch (ClassCastException e) {
+      assertTrue(true);
+    }
+  }
+}

src/test/java/com/examplehub/basics/exception/CustomExceptionExampleTest.java

@@ -0,0 +1,16 @@
+package com.examplehub.basics.exception;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class CustomExceptionExampleTest {
+  @Test
+  void testCustomException() {
+    try {
+      throw new CustomExceptionExample("custom exception");
+    } catch (CustomExceptionExample e) {
+      assertEquals("custom exception", e.getMessage());
+    }
+  }
+}

src/test/java/com/examplehub/basics/exception/FinallyExampleTest.java

@@ -0,0 +1,33 @@
+package com.examplehub.basics.exception;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class FinallyExampleTest {
+  @Test
+  void testWithCatch() {
+    int result = 0;
+    try {
+      int number = 10 / 2;
+    } finally {
+      result++;
+    }
+    assertEquals(1, result);
+  }
+
+  @Test
+  void testReturn() {
+    assertEquals(3, func());
+  }
+  public int func() {
+    try {
+      int num = 10 / 0;
+      return 1;
+    } catch (ArithmeticException e) {
+      return 2;
+    }finally {
+      return 3;
+    }
+  }
+}

src/test/java/com/examplehub/basics/exception/IndexOutOfBoundsExceptionExampleTest.java

@@ -0,0 +1,22 @@
+package com.examplehub.basics.exception;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class IndexOutOfBoundsExceptionExampleTest {
+  @Test
+  void testArrayAccess() {
+    int[] nums = {1, 2, 3, 4, 5};
+    try {
+      int sum = 0;
+      for (int i = 0; i <= nums.length; ++i) {
+        sum += nums[i];
+      }
+      System.out.println("sum = " + sum);
+      fail();
+    } catch (IndexOutOfBoundsException e) {
+      assertTrue(true);
+    }
+  }
+}

src/test/java/com/examplehub/basics/exception/NullPointerExceptionExampleTest.java

@@ -0,0 +1,18 @@
+package com.examplehub.basics.exception;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class NullPointerExceptionExampleTest {
+  @Test
+  void testNullPointer() {
+    try {
+      String str = null;
+      System.out.println(" str length = " + str.length());
+      fail();
+    } catch (NullPointerException e) {
+      assertTrue(true);
+    }
+  }
+}

src/test/java/com/examplehub/basics/exception/NumberFormatExceptionExampleTest.java

@@ -0,0 +1,17 @@
+package com.examplehub.basics.exception;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class NumberFormatExceptionExampleTest {
+  @Test
+  void testFormatNumber() {
+    try {
+      int number = Integer.parseInt("123a");
+      fail();
+    } catch (NumberFormatException e) {
+      assertTrue(true);
+    }
+  }
+}

src/test/java/com/examplehub/basics/exception/ThrowsExceptionExampleTest.java

@@ -0,0 +1,39 @@
+package com.examplehub.basics.exception;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class ThrowsExceptionExampleTest {
+  @Test
+  void testReceiveException() {
+    try {
+      int num = division(3, 0);
+      fail();
+    } catch (ArithmeticException e) {
+      assertTrue(true);
+    }
+  }
+
+  public int division(int a, int b) throws ArithmeticException {
+    return a / b;
+  }
+
+  @Test
+  void testThrowException() {
+    try {
+      int number = parseInt("123a");
+      fail();
+    } catch (NumberFormatException e) {
+      assertTrue(true);
+      assertEquals("can't contains non-digits", e.getMessage());
+    }
+  }
+
+  public int parseInt(String str) throws NumberFormatException{
+    if (!str.matches("\\d+")){
+      throw new NumberFormatException("can't contains non-digits");
+    }
+    return Integer.parseInt(str);
+  }
+}