if ( fiber >= 4 || foam >= 3 )
  System.out.println("House passes the code requirements!" );
else
  System.out.println("House fails." );

Difference between AND and OR

Here is what would happen if a house had 6 inches of fiberglass batting and 0 inches of plastic foam:

fiber >= 4 || foam >= 3
---------    ---------
  true          false
   ---------------
        true

One true is enough.

AND is different from OR. Both of them combine Boolean values ( true/false values ) into one Boolean value. But each does this in a different way:

• All the values AND combines must be true to get a true.
• At least one of the values OR combines must be true to get a true.

The operation of AND and OR can be displayed in a truth table. In the table, A and B are operands. They stand for true/false values or expressions that yield true/false values. For example, A could stand for a relational expression such as memory > 512 or a String comparison like phrase.equals( "quit" ).

A	B	A && B	A || B
F	F	F	F
F	T	F	T
T	F	F	T
T	T	T	T

Each row of the truth table shows what can be simultaneously true. For example, row one says that if A is false and B is false, then A && B is false also A || B is false.

Row three says that if A is true and B is false, then A && B is false also A || B is true.

All possible truth values of the operands A and B are listed in the left two columns. Each operand can take the value true or the value false, so there are four possible combinations of values for the two operands.