جافا Java

❓ Switch على String بدون break بعد "two"؟ Switch on String (no break after "two")?

String s = "two";
switch (s) {
  case "one": System.out.print(1); break;
  case "two": System.out.print(2);
  default: System.out.print(0);
}

❓ هل a == b صحيح؟ Is a == b true?

String a = new String("hi");
String b = "hi";
System.out.println(a == b);

❓ ما قيمة count بعد استخدام continue؟ What is count after using continue?

int count = 0;
for (int i = 0; i < 5; i++) {
  if (i % 2 == 0) continue;
  count += i;
}
System.out.println(count);

❓ هل يعدّل for-each عناصر المصفوفة؟ Does for-each modify elements?

int[] a = {1, 2, 3};
for (int x : a) { x *= 2; }
System.out.println(a[1]);

❓ كيف تطبع طول المصفوفة؟ How do you print the array length?

int[] a = {1, 2, 3, 4};
System.out.println( /* ? */ );

❓ أي overload يُستدعى؟ Which overload is invoked?

void print(int x) { System.out.println("int"); }
void print(Integer x) { System.out.println("Integer"); }

Integer n = null;
print(n);

❓ ما ناتج السويتش بدون break؟ What is the output (no breaks before case 3)?

int n = 2;
switch (n) {
  case 1: System.out.print('A');
  case 2: System.out.print('B');
  case 3: System.out.print('C'); break;
  default: System.out.print('D');
}

❓ ما مجموع الأعداد من 1 إلى 3؟ What does this loop print?

int sum = 0;
for (int i = 1; i <= 3; i++) {
  sum += i;
}
System.out.println(sum);

❓ ما ناتج الكود التالي؟ What is the output of the following code?

int x = 5;
if (x > 3) x++;
if (x == 6) x += 2;
System.out.println(x);

❓ خطأ فهرسة في حلقة Index error in loop

int[] a = {1,2,3};
for (int i = 0; i <= a.length; i++) {
  System.out.print(a[i]);
}