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So I have this assignment for my Programming class, and I'm lost on what to do for the second part. This is the code I have so far:

    class SingleArray
    {
      public static void main(String[]args)
      {
        int[] b=new int[]{5,10,15,20,25,30,35,40,45,50};

Not much I know, but I really am confused on how I would get it to fetch the different array values. Do I have to import the util scanner to do this? Any help to point me in the right direction? Thanks guys!

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1  
Break down the big problem into little problems: 1) how to prompt the user and get input, and 2) with the input get and return the value based on index. –  Hovercraft Full Of Eels Jul 17 at 2:05
 
docs.oracle.com/javase/tutorial/java/nutsandbolts/arrays.html –  dnault Jul 17 at 2:07
 
(Off-topic) Close your teacher's assignment. It's unclear. –  johnchen902 Jul 17 at 2:18

3 Answers

up vote 1 down vote

To access an index i in int[] b, you use: b[i]. For example:

System.out.println(b[i]); //prints the int at index i

b[i] = 5; //assigns 5 to index i
b[i] = x; //assigns an int x, to index i

int y = b[i];  //assigns b[i] to y

To search through the array for a number x:

for (int i = 0; i < b.length; i++)
{
     if (b[i] == x)
     {
         //doSomething
     }
}

There are also auxiliary methods provided by the Java Arrays class.

Here's a tutorial on arrays, here's an additional Java Language Basics tutorial.

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up vote 0 down vote

Please do the assignments in the comments below-

class SingleArray {

 // Declare an array of 10 integers. 
 // Assignment: Why did I declare it as static?
 private static int[] array = new int[] { 5, 10, 15, 20, 25, 30, 35, 40, 45, 50 };

 // A method that returns the value at a given index from the array
 // Assignment: Why the method below is static?
 private static int getValue(int index){

     return array[index];

 }    

 public static void main(String[] args){

    for (int i = 0; i < array.length; i++){

        int valueAtIndex = getValue(i);

        System.out.println("Index: " + (i + 1) + " Value: " + valueAtIndex);

        // Assignment: remove the statement "int valueAtIndex = getValue(i);" and 
        // modify the System.out.println statement to have the same result 

    }

  }

}
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up vote 0 down vote 
List<Integer> integerList=new ArrayList<Integer>();
for(int i=0;i<10;i++){
 integerList.add(i);
}
//you can fetch the values by using this method:
integerList.get(valueIndex);
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