Nestedmultiple blocks
CODE
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class Lifetime
{
public static void main(String arg[])
{
for(int x = 0; x < 3; x++)
{
int y = -1; // LINE A
System.out.println( "y is : " + y );
y = 100;
System.out.println( "y is now : " + y ); // LINE B
}
}
}
y is : -1
y is now : 100
y is : -1
y is now : 100
y is : -1
y is now : 100
When the for loop executes first iteration with x = 0, the variable y is declared and initialized to -1. Later it is changed to 100. But when the iteration is completed after LINE B, the variable y declared in the block goes out of scope or its lifetime ends. The value 100 stored in y is gone. So when the iteration runs again with x = 1, y is declared again and initialized to -1.
int y = -1; in LINE A above the for loop i.e. and see that value of y is retained between iterations. This is because y is declared above the for loop and its lifetime does not end after LINE B and so it continues to store the previous value 100.