FUNDAMENTALS

1.
    final int y = 9;
    int i = y++;

    not compile, cannot change y value.
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2.
    float i = 3;
    byte b =3;
    b+=i;

    compile, += performs autocast

    float i = 3;
    byte b = 3;
    b = b+i;
 
    will not compile
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3.
    int [] tab = new int['a'];

    will compile, chars are implicitly promoted to ints
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4.

    private int get() {
        return Integer.MAX_VALUE+1;                    //correct, also for long, float and double
    }

    private short get() {
        return Short.MAX_VALUE+1;                      //incorrect
    }

    private byte get() {
        return Byte.MAX_VALUE+1;                       //incorrect
    }