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

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');
}

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

Integer n = null;
print(n);

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

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

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

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

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

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]);

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

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