How to convert string to array of integers in java?

You can convert a String to integer using the parseInt() method of the Integer class. To convert a string array to an integer array, convert each element of it to integer and populate the integer array with them.

Example

<span class="kwd">import</span><span class="pln"> java</span><span class="pun">.</span><span class="pln">util</span><span class="pun">.</span><span class="typ">Arrays</span><span class="pun">;</span><span class="pln">
</span><span class="kwd">public</span><span class="pln"> </span><span class="kwd">class</span><span class="pln"> </span><span class="typ">StringToIntegerArray</span><span class="pln"> </span><span class="pun">{</span><span class="pln">
   </span><span class="kwd">public</span><span class="pln"> </span><span class="kwd">static</span><span class="pln"> </span><span class="kwd">void</span><span class="pln"> main</span><span class="pun">(</span><span class="typ">String</span><span class="pln"> args</span><span class="pun">[])</span><span class="pln"> </span><span class="pun">{</span><span class="pln">
      </span><span class="typ">String</span><span class="pln"> </span><span class="pun">[]</span><span class="pln"> str </span><span class="pun">=</span><span class="pln"> </span><span class="pun">{</span><span class="str">"123"</span><span class="pun">,</span><span class="pln"> </span><span class="str">"345"</span><span class="pun">,</span><span class="pln"> </span><span class="str">"437"</span><span class="pun">,</span><span class="pln"> </span><span class="str">"894"</span><span class="pun">};</span><span class="pln">
      </span><span class="kwd">int</span><span class="pln"> size </span><span class="pun">=</span><span class="pln"> str</span><span class="pun">.</span><span class="pln">length</span><span class="pun">;</span><span class="pln">
      </span><span class="kwd">int</span><span class="pln"> </span><span class="pun">[]</span><span class="pln"> arr </span><span class="pun">=</span><span class="pln"> </span><span class="kwd">new</span><span class="pln"> </span><span class="kwd">int</span><span class="pln"> </span><span class="pun">[</span><span class="pln">size</span><span class="pun">];</span><span class="pln">
      </span><span class="kwd">for</span><span class="pun">(</span><span class="kwd">int</span><span class="pln"> i</span><span class="pun">=</span><span class="lit">0</span><span class="pun">;</span><span class="pln"> i</span><span class="pun"><</span><span class="pln">size</span><span class="pun">;</span><span class="pln"> i</span><span class="pun">++)</span><span class="pln"> </span><span class="pun">{</span><span class="pln">
         arr</span><span class="pun">[</span><span class="pln">i</span><span class="pun">]</span><span class="pln"> </span><span class="pun">=</span><span class="pln"> </span><span class="typ">Integer</span><span class="pun">.</span><span class="pln">parseInt</span><span class="pun">(</span><span class="pln">str</span><span class="pun">[</span><span class="pln">i</span><span class="pun">]);</span><span class="pln">
      </span><span class="pun">}</span><span class="pln">
      </span><span class="typ">System</span><span class="pun">.</span><span class="kwd">out</span><span class="pun">.</span><span class="pln">println</span><span class="pun">(</span><span class="typ">Arrays</span><span class="pun">.</span><span class="pln">toString</span><span class="pun">(</span><span class="pln">arr</span><span class="pun">));</span><span class="pln">
   </span><span class="pun">}</span><span class="pln">
</span><span class="pun">}</span>

Output

[123, 345, 437, 894]