int[] arr = new int[3];
System.out.println(arr[1]);

static int sum(int... xs){ int s=0; for(int x: xs) s+=x; return s; }
System.out.println(sum(1,2,3));

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

int[] a = new int[4];
java.util.Arrays.fill(a, 2);
System.out.println(a[3]);

void bump(Integer x){ x++; }
Integer v = 1;
bump(v);
System.out.println(v);

int[] a = {1,2,3};
int[] b = java.util.Arrays.stream(a).map(x -> x * 2).toArray();
System.out.println(a[1] + "," + b[1]);

class A { static { System.out.print("A"); } }
class B extends A { static { System.out.print("B"); } }
new B();

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

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

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');
}