title: How to store non-unique key value pair in core java 1.4
body: <p>i need to store non unique key value pair like in an application which can only be compiled with java 1.4. It should look like : </p>
  
  <pre><code>{"key1"=&gt;"value1",
  "key2"=&gt;"value2",
  "key3"=&gt;"value3",
  "key3"=&gt;"value4"
  }
  </code></pre>
  
  <p>thanks in advance</p>