heap_pollution_on_varargs.java

public static <l> L[] createHeapPollution(L... args) {
  Object[] elements = args;
  elements[0] = Arrays.asList(12, 12);
 
 return args;
}
 
public static void main(String... args) {
  List<string>[] polluted = createHeapPollution(Arrays.asList("a", "b", "c"));
  // java.lang.Integer cannot be cast to java.lang.String
  String element = polluted[0].get(0);
}

if_with_string.java

public void perfom(String userInput) {
  userInput = userInput.toLowerCase(Locale.US);
  if (userInput.equals("YES")) {
    performYes();
  } else if (userInput.equals("NO")) {
    performNo();
  } else if (userInput.equals("CANCEL")) {
    performCancel();
  } else if (userInput.equals("YES TO ALL")) {
    performYesToAll();
  } else if (userInput.equals("NO TO ALL")) {
    performNoToAll();
  } else {
    throw new IllegalArgumentException();
  }
}

integer_literals.java

int dec = 153;
int hex = 0x99;
int oct = 0231;
int bin = 0b10011001;
 
Assert.assertEquals(dec, hex);
Assert.assertEquals(hex, oct);
Assert.assertEquals(oct, bin);
Assert.assertEquals(bin, dec);

reflection_in_java6.java

try {
  callWithReflection(arg);
} catch (NoSuchMethodException e) {
  throw new RuntimeException(e);
} catch (IllegalAccessException e) {
  throw new RuntimeException(e);
} catch (InvocationTargetException e) {
  throw new RuntimeException(e);
} catch (ClassNotFoundException e) {
  throw new RuntimeException(e);
} catch (IOException e) {
  throw new RuntimeException(e);
}

safe_varargs_annotation.java

@SafeVarags
public static <l> L[] createHeapPollution(L... args) {
  return args;
}
 
public static void main(String... args) {
  List<string>[] unpolluted = createNoHeapPollution(Arrays.asList("a", "b", "c"));
  String element = unpolluted[0].get(0);
}

switch_with_chars.java

public void perfom(char userInput) {
  userInput = Character.toUpperCase(userInput);
  switch (userInput) {
    case 'Y':
      performYes();
      break;
    case 'N':
      performNo();
      break;
    case 'C':
      performCancel();
      break;
    case 'A':
      performYesToAll();
      break;
    default:
       throw new IllegalArgumentException();
  }
}

switch_with_string.java

public void perfom(String userInput) {
  userInput = userInput.toLowerCase(Locale.US);
  switch (userInput) {
    case "YES":
      performYes();
      break;
    case "NO":
      performNo();
      break;
    case "CANCEL":
       performCancel();
       break;
    case "YES TO ALL":
       performYesToAll();
       break;
    case "NO TO ALL":
      performNoToAll();
      break;
    default:
      throw new IllegalArgumentException();
  }
}

underscore_integer.java

private long salary = 15_500_000_000L;
private int bitmask = 0b1010_1011;

with_diamond.java

Map<patient , Map<LocalDate, List<Medication>>> medications = new HashMap<>();

without_diamond.java

Map<patient , Map<LocalDate, List<Medication>>> medications = new HashMap<Patient , Map<LocalDate, List<Medication>>>();