CODEWITHSUNDEEP
javaandroid
KaHeL
KaHeL

Reputation: 4371

Get the string value from List<String> through loop for display

I'm confused about on how to use this array in a way that is simple. Well I already passed the values from the JSON into a List and now I need to retrieve it using a loop (and just loop) but I don't know how. Tried reading some answers but I found myself really confused in the end. I just want it to be simple as making a String array, loop and fetch data by getting the variable[index] simple as that but all the answers I've found just lead me into confusion. Help please.

Upvotes: 17

Views: 329301

Answers (7)

shivakumar hk
shivakumar hk

Reputation: 11

pst = con.createStatement(); ResultSet resultSet= pst.executeQuery(query);

     String str1 = "<table>";
     int i = 1;
    while(resultSet.next()) {
             str1+= "</tr><td>"+i+"</td>"+
             "<td>"+resultSet.getString("first_name")+"</td>"+
             "<td>"+resultSet.getString("last_name")+"</td>"+
             "<td>"+resultSet.getString("email_id")+"</td>"+
             "<td>"+resultSet.getString("dob") +"</td>"+

             "</tr>";
        i++;

    }
        str1 =str1+"<table>";

    model.addAttribute("list",str1);

    return "userlist";  //Sending to views .jsp

Upvotes: 0

user370305
user370305

Reputation: 109237

As I understand your question..

From Java List class you have to methods add(E e) and get(int position).

add(E e)

Appends the specified element to the end of this list (optional operation).

get(int index)

Returns the element at the specified position in this list.

Example:

List<String> myString = new ArrayList<String>();

// How you add your data in string list
myString.add("Test 1");
myString.add("Test 2");
myString.add("Test 3");
myString.add("Test 4");

// retrieving data from string list array in for loop
for (int i=0;i < myString.size();i++)
{
  Log.i("Value of element "+i,myString.get(i));
}

But efficient way to iterate thru loop

for (String value : myString)
{
  Log.i("Value of element ",value);
}

Upvotes: 33

user3730812
user3730812

Reputation: 1

Answer if you only want to use for each loop ..

for (WebElement s : options) {
    int i = options.indexOf(s);
    System.out.println(options.get(i).getText());
}

Upvotes: 0

Kanagalingam
Kanagalingam

Reputation: 2184

List<String> al=new ArrayList<string>();
al.add("One");
al.add("Two");
al.add("Three");

for(String al1:al) //for each construct
{
System.out.println(al1);
}

O/p will be 

One
Two
Three

Upvotes: 0

Snehal Parmar
Snehal Parmar

Reputation: 5833

Try following if your looking for while loop implementation.

List<String> myString = new ArrayList<String>();

// How you add your data in string list
myString.add("Test 1");
myString.add("Test 2");
myString.add("Test 3");
myString.add("Test 4");

int i = 0;
while (i < myString.size()) {
    System.out.println(myString.get(i));
    i++;
}

Upvotes: 1

Kumar Vivek Mitra
Kumar Vivek Mitra

Reputation: 33534

Use the For-Each loop which came with Java 1.5, and it work on Types which are iterable. 

ArrayList<String> data = new ArrayList<String>();
data.add("Vivek");
data.add("Vadodara");
data.add("Engineer");
data.add("Feelance");

for (String s : data){

 System.out.prinln("Data of "+data.indexOf(s)+" "+s);

 }

Upvotes: 1

amicngh
amicngh

Reputation: 7899

public static void main(String[] args) {

    List<String> ls=new ArrayList<String>();
    ls.add("1");
    ls.add("2");
    ls.add("3");
    ls.add("4");

//Then  you can use "foreache" loop to iterate.

    for(String item:ls){
        System.out.println(item);
    }

}

Upvotes: 9

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