add string to String array

Question

I am new in Java so I need little help  I have   String    scripts   new String      test3   test4   test5      and I want to add new strings   string1 string2  to this array   scripts   for examples  String string1    test1  String string2    test2    I want to add the new string not in the init but in later phase  How I can do it

User · Answer

As many of the answer suggesting better solution is to use ArrayList. ArrayList size is not fixed and it is easily manageable.

It is resizable-array implementation of the List interface. Implements all optional list operations, and permits all elements, including null. In addition to implementing the List interface, this class provides methods to manipulate the size of the array that is used internally to store the list.

Each ArrayList instance has a capacity. The capacity is the size of the array used to store the elements in the list. It is always at least as large as the list size. As elements are added to an ArrayList, its capacity grows automatically.

Note that this implementation is not synchronized.

ArrayList<String> scripts = new ArrayList<String>();
scripts.add("test1");
scripts.add("test2");
scripts.add("test3");

User · Answer

You cannot resize an array in java   Once the size of array is declared  it remains fixed   Instead you can use ArrayList that has dynamic size  meaning you don t need to worry about its size  If your array list is not big enough to accommodate new values then it will be resized automatically   ArrayList lt String gt  ar   new ArrayList lt String gt     String s1   Test1   String s2   Test2   String s3   Test3   ar add s1   ar add s2   ar add s3    String s4   Test4   ar add s4

User · Answer

First  this code here   string    scripts   new String      test3   test4   test5      should be  String   scripts   new String      test3   test4   test5      Please read this tutorial on Arrays  Second   Arrays are fixed size  so you can t add new Strings to above array  You may override existing values  scripts 0    string1     or    Create array with size then keep on adding elements till it is full   If you want resizable arrays  consider using ArrayList

User · Answer

Since Java arrays hold a fixed number of values  you need to create a new array with a length of 5 in this case  A better solution would be to use an ArrayList and simply add strings to the array   Example   ArrayList lt String gt  scripts   new ArrayList lt String gt     scripts add  test3    scripts add  test4    scripts add  test5        Then later you can add more Strings to the ArrayList scripts add  test1    scripts add  test2

User · Answer

you would have to write down some method to create a temporary array and then copy it like     public String   increaseArray String   theArray  int increaseBy            int i   theArray length        int n     i        String   newArray   new String n         for int cnt 0 cnt lt theArray length cnt                    newArray cnt    theArray cnt                 return newArray          or The ArrayList would be helpful to resolve your problem

[java] add string to String array

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