جافا Java

❓ أي استدعاء يُفضَّل مع varargs؟ Which overload is chosen with varargs?

static void m(int x) { System.out.print("exact"); }
static void m(int... x) { System.out.print("varargs"); }

m(5);

❓ كيف يعمل fall-through عندما يطابق case 1؟ How does fall-through work here?

int d = 1;
switch (d) {
  case 0: d += 2;
  default: d += 3;
  case 1: d += 4;
}
System.out.println(d);

❓ كم عدد الزيادات؟ How many increments occur?

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

❓ تأثير i++ داخل شرط while؟ Effect of i++ in while condition?

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

❓ تمرير المصفوفات للميثود: ماذا يُطبع؟ Passing arrays to methods: what prints?

void change(int[] arr) {
  arr[0] = 99;
  arr = new int[]{7,7,7};
}
int[] x = {1,2,3};
change(x);
System.out.println(x[0]);

❓ 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( /* ? */ );