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8.3. Using a For Loop to Loop Through an Array

You can also use a for loop to loop through all the elements of an array. Just start the index at 0 and loop while the index is less than the length of the array.

public class ArrayWorker { private int[ ] values; public ArrayWorker(int[] theValues) { values = theValues; } public void multAll(int amt) { for (int i = 0; i < values.length; i++) { values[i] = values[i] * amt; } // end for loop } // end method public void printValues() { for (int val : values ) { System.out.println(val); } } public static void main(String[] args) { int[] numArray = {2, 6, 7, 12, 5}; ArrayWorker aWorker = new ArrayWorker(numArray); aWorker.multAll(2); aWorker.printValues(); } }

Mixed up programs

The following method has the correct code to subtract amt from all the values in the array <b>values</b> (a field of the current object), but the code is mixed up. Drag the blocks from the left into the correct order on the right and indent them correctly. You will be told if any of the blocks are in the wrong order or not indented correctly.

        public void subAll(int amt)
{
---
   for (int i = 0;
        i < values.length;
        i++)
   {
---
      values[i] = values[i] - amt;
---
   } // end for loop
---
} // end method
        

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