Iterating an Array Using the for Statement [5.0]
The for statement can be used to conveniently iterate over the
elements of an array. The general syntax of the array-based for
statement is:
The array-based for statement has four parts. The array
is an expression that returns an array. The type specifies the
type of variable which will be used to hold elements from the
array. In particular, variable always holds the current
element of the iteration and can be used by the code in
body-code. body-code is code that will be executed once
for every element in the array. Here is an example of the for
statement.
for (type variable : array) { body-code }
// Returns the smallest integer in the supplied array
public int getMin(int[] ints) {
int min = Integer.MAX_VALUE;
for (int num : ints) {
if (num < min) {
min = num;
}
}
return min;
}
hi..im new in programming...can we use arrays in an if-else statement...
im trying this: if(xyz[0][0] == xyz[1][1] == xyz[2][2]) ..... it says incompatible types :( pls help me..thanks :D
You have syntax error. What is
xyz[0][0] == xyz[1][1] == xyz[2][2] ?
Do you mean this ?
(xyz[0][0] == xyz[1][1]) && (xyz[1][1] == xyz[2][2])
or this ? (xyz[0][0] == xyz[1][1]) && (xyz[1][1] == xyz[2][2]) && (xyz[0][0] == xyz[2][2])
You are lucky the compiler caught this. Think about what happens if xyz[][] is a Boolean. no compiler error.
I recommend you review this till you understand why you are seeing the error. Think about what happens if you type
if ( x==y==z) {...}
is it any different to
if ((x==y)==z) {....}
Rule 42: Simplify your if's or you get but's!!!
Python is the only language I know that can do x==y==z (or x==y==z etc) the same as mathmaticians.
import java.util.ArrayList;
import java.util.Iterator;
public class Library
{
private ArrayList items;
public Library()
{
items = new ArrayList();
}
public void removeItem(int catalogId)
{
Iterator it = items.iterator();
while(it.hasNext())
{
LibraryItem item = it.next();
if (item.getCatalogId() == catalogId){
it.remove();
}
}
}
}
(a == b) is a boolean, true or false, so you cannot write : a == b == c unless c is a boolean.
In your case maybe xyz[0][0] contains an integer or a float or anything else, so you cannot write xyz[0][0] == true, they are incompatible types.
you have to write (xyz[0][0]==xyz[1][1] && xyz[0][0]==xyz[2][2])
They are two comparisons of objects of the same type, resulting in booleans, and then you can use '&&' between those booleans.
That's an example of how the compiler does execute your code :
1) xyz[0][0]==xyz[1][1] ---> true
2) xyz[0][0]==xyz[2][2] ---> false
3) true && false ---> false
How the threads will be allocated when 2 jvm's run in one system
Hi java fellows,I need one solution for the problem.
I am working on java mvc project using ibm rad software and jsp.
The problem is:
I have to retrieve two column datas from db. The one column name is level and another is unit.
For example the data's in table may look like this
Level unit
1 402
1 403
2 404
2 406
3 407
3 408
Here you have to check max level and number of units.
For the above the column the data should be displayed like below on browserm
3-407 3-408
2-404 2-406
1-402 1-403
I want display like above.whereever there is no data blank space should be displayed else the data whatever retrieved from db has to be displayed.so how to find the missed spaces.
Actually I have used hashmap to find the number of levels and units.here I got stuck.so please whoever reading this article,help me.thanks in advance...
I have mentioned spaces comes here where ever the datas are not there.the db is retrieving only 6 values but I want to show the result in a table format which has 3 rows and 3 columns.
For example the data's in table may look like this
Level unit
1 402
1 403
2 404
2 406
3 407
3 408
Here you have to check max level and number of units.
For the above the column the data should be displayed like below on browserm
3-407 3-408 here space comes
2-404 here space comes 2-406
Here space comes 1-402 1-403
I want display like above.whereever there is no data blank space should be displayed else the data whatever retrieved from db has to be displayed.so how to find the missed spaces.
Actually I have used hashmap to find the number of levels and units.here I got stuck.so please whoever reading this article,help me.thanks in advance...