Difference between and in Java

Question

Possible Duplicates    What  39 s the difference between   and    in Java    Difference in  amp  and  amp  amp        I was just wondering what the difference between  amp  and  amp  amp  is  A few days I wrote a condition for an if statement the looked something like   if x  lt  50  amp  amp  x  gt  0    However  I changed the  amp  amp  to just  amp  and it showed no errors   What s the difference     Example   I compiled this simple program   package anddifferences   public class Main        public static void main String   args            int x   25          if x  lt  50  amp  amp  x  gt  0                System out println  OK                       if x  lt  50  amp  x  gt  0                System out println  Yup                        It printed  OK  and  Yup    So does it matter which one I use if they both work

User · Accepted Answer

amp  is bitwise   amp  amp  is logical    amp  evaluates both sides of the operation   amp  amp  evaluates the left side of the operation  if it s true  it continues and evaluates the right side

User · Answer

amp  is bitwise AND operator comparing bits of each operand   For example   int a   4  int b   7  System out println a  amp  b      prints 4   meaning in an 32 bit system    00000000 00000000 00000000 00000100    00000000 00000000 00000000 00000111                                           00000000 00000000 00000000 00000100    amp  amp  is logical AND operator comparing boolean values of operands only  It takes two operands indicating a boolean value and makes a lazy evaluation on them

User · Answer

amp  amp     logical AND   amp    bitwise AND

User · Answer

amp   performs both tests  while   amp  amp   only performs the 2nd test if the first is also true  This is known as shortcircuiting and may be considered as an optimization  This is especially useful in guarding against nullness NullPointerException    if  x    null  amp  amp  x equals   BINGO        then do something with x

[java] Difference between & and && in Java?

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