how to get values from hashmap using loop

This question already has an answer here:

How to efficiently iterate over each entry in a 'Map'? 38 answers

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if (onLine != null) {
    for (String k : onLine.keySet()) {
        for (String v : onLine.get(k)) {
            out.print(v);
        }
    }
}

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java.util.Map为此具有一个values（）方法：

for(List<String> nextArray : onLine.values()) {
    for(String nextString : nextArray) {
        out.print(nextString);
    }
}

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Try this:

if (onLine != null) {
    for (String key : onLine.keySet()) {
        for (List<String> val : onLine.get(key)) {
            for(String str : val){
                System.out.print(str);
            }
        }
    }
}

This will print all the strings in your map.

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