Java: Control Structures

Conditionals

if (condition)
{
}
[else if (condition)
{
}]
[else 
{
}]

switch statements

• The selector variable must be one of the following types:
• Primative types: byte, short, char or int
• Wrapper types: Character, Byte, Short, Integer
• enumerated types
• String type
• The following primative types cannot be used for selector variables:
• boolean, long, float, double

String ret;
switch (x)
{
    case 0:
        rtn = "0";
        break;

    case 1:
        rtn = "1";
        break;

    case 2:
        rtn = "2";
        break;

    case 3:
        rtn = "3";
        break;

    case 4:
        rtn = "4";
        break;

    case 5:
        rtn = "5";
        break;

    case 6:
        rtn = "6";
        break;

    case 7:
        rtn = "7";
        break;

    case 8:
        rtn = "8";
        break;

    case 9:
        rtn = "9";
        break;

    default:
        rtn = "";
};

while Loops

• pre-check

while (condition)
{
}

do while Loops

• post-check

do
{
}
while (condition);

for Loop

for (initialization; termination; increment)
{
}

for Loop - to iterate thru an array or Collection

int[] intArray = {1, 2, 3, 4, 5};

for (int item : intArray)
{
    System.out.println ("item=" + item)
}

break Statement

continue Statement

return Statement