java tips

Named loops:

outer: 
    for (i = 0; i < arr.length; i++) {
        for (j = 0; j < arr[i].length;  j++) { 
            if (someCondition(i, j)) { 
                break outer; 
             } 
        }
    }

Class definitions can go anywhere:

class Test {
    public static void main(String[] args) {
        class Inner {
            void wut() {
                System.out.println("wut");
            }
        }
        new Inner().wut();
    }
}

There is an Object called Void

Void (Java Platform SE 7 ) - (Common use case is for generic methods which need not return a value)

Double bracing Lists allows you to declare and initialize without Arrays.asList()

List<String> places = new ArrayList<String>() {
    { add("x"); add("y"); }
};

Static methods can be generic

class Test {
 
    static <T> T identity(T t) {
        return t;
    }
 
    public static void main(String[] args) {
        String s = Test.<String> identity("Hi");
        System.out.print(s);
    }
}

You can supply variable length params

void example(String...strings) {};

Joint-union in generic type params

public class Baz<T extends Foo & Bar> {}

Define, instantiate, and call all at once

new Object() {
    void hi(String in) {
        System.out.println(in);
    }
}.hi("weird");