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syntactic unit > statement > control flow statement > loop statement
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loop statement comparison table
Subject have example have syntax have disadvantage have purpose has part interchange with have advantage
do-while loop
int c;
Reader in; 
. . . 
do { 
   c = in.read(); 
   . . . 
} while (c != -1);
for (entry expression; boolean expression; continuation expression) {
   //statements to keep executing while boolean expression is true
}
 to execute a section of code more than once   
for loop
a is an array of some kind 
. . .
int i; 
int length = a.length; 
for (i = 0; i < length; i++) { 
   . . . 
   // do something to the i th element of a 
   . . . 
}
for(initializer; condition; incrementer)
{
   // statements to keep executing while condition is true
}
it can be slightly harder to read the code of a for loop than a while loopto execute a section of code more than onceinitializera while loopall the information about controlling the loop is kept in one place
while loop
//Decrement n by 1 until n is 0
while (n != 0) {
   n = n - 1;
} 
while(condition)
{
   // statements to keep executing while condition is true
}
 to repeat a computation by looping through that computation until a test has been satisfied a for loop 

Next control flow statement: return statement    Up: control flow statement    Previous control flow statement: label statement