For Statement in java ~ Online tutorial

For Statement in java

for Statement
ForStatement:

1)BasicForStatement
2)EnhancedForStatement

The for statement has two forms:

• The basic for statement.
• The enhanced for statement

The basic for Statement

The basic for statement executes some initialization code, then executes an
Expression, a Statement, and some update code repeatedly until the value of the
Expression is false.

BasicForStatement:

for ( ForInitopt ; Expressionopt ; ForUpdateopt ) Statement

ForStatementNoShortIf:

for ( ForInitopt ; Expressionopt ; ForUpdateopt )
StatementNoShortIf
ForInit:

StatementExpressionList
LocalVariableDeclaration

ForUpdate:

StatementExpressionList
StatementExpressionList:

StatementExpression
StatementExpressionList , StatementExpression
The Expression must have type boolean or Boolean, or a compile-time error
occurs.

The following example, which calculates the sum of an integer array, shows how enhanced
for works for arrays:

int sum(int[] a)
{
int sum = 0;
for (int i : a)
sum += i;
return sum;
}

Here is an example that combines the enhanced for statement with auto-unboxing to translate
a histogram into a frequency table:

Map histogram = ...;
double total = 0;
for (int i : histogram.values())
total += i;
for (Map.Entry e : histogram.entrySet())
System.out.println(e.getKey() + "" + e.getValue() / total);

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