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    copied!<p>Your code is bad formed here:</p> <pre><code>while(iterator.hasNext()){ hashMap.values().toArray(); for (???) { // lets print array here for example } } </code></pre> <p>You try to iterate using the Iterator "iterator" but next you call to </p> <pre><code>hashMap.values().toArray(); </code></pre> <p>To get the next item of the loop you need to use iterator.next(); to fetch it. Also is good to change the "Object" by String[][] or to <code>List&lt;String[]&gt; or List&lt;List&lt;String&gt;&gt;</code>.</p> <pre><code>import java.util.HashMap; import java.util.Map; import java.util.Iterator; import java.util.Map.Entry; public static void main(String[] args) { String[][] layer1 = { {"to1", "TYPE1", "start"}, {"to2", "TYPE1", "start"} }; Map&lt;String,String[][]&gt; map= new HashMap&lt;String,String[][]&gt;(); map.put("layer1", layer1); Iterator&lt;Entry&lt;String, String[][]&gt;&gt; iterator = map.entrySet().iterator(); while(iterator.hasNext()){ Entry&lt;String, String[][]&gt; entry = iterator.next(); System.out.println("Key:" + entry.getKey()); String[][] value = entry.getValue(); for(int x=0;x&lt;value.length;x++){ for(int y=0;y&lt;value[x].length;y++){ System.out.println("String[" + x + "][" + y + "]:" + value[x][y]); } } } } </code></pre> <p>Also you can use "for each" loop to simplify the code insted using the "while":</p> <pre><code>for (Entry&lt;String, String[][]&gt; entry : map.entrySet()){ System.out.println("Key:" + entry.getKey()); String[][] value = entry.getValue(); for(int x=0;x&lt;value.length;x++){ for(int y=0;y&lt;value[x].length;y++){ System.out.println("String[" + x + "][" + y + "]:" + value[x][y]); } } } </code></pre> <p>Or if you only need the values:</p> <pre><code>for (Entry&lt;String, String[][]&gt; entry : map.values()){ String[][] value = entry.getValue(); for(int x=0;x&lt;value.length;x++){ for(int y=0;y&lt;value[x].length;y++){ System.out.println("String[" + x + "][" + y + "]:" + value[x][y]); } } } </code></pre>
 

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