Java Example - Collection Size

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Java Examples

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The following example demonstrates how to use the Collections class's collection.add() to add data and collection.size() to calculate the size of the collection:

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Main.java File

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import java.util.*;\n\npublic class Main {\n    public static void main(String[] args) {\n        System.out.println("Collection Instance!n");\n        int size;\n        HashSet collection = new HashSet();\n        String str1 = "Yellow", str2 = "White", str3 = "Green", str4 = "Blue";\n        Iterator iterator;\n        collection.add(str1);\n        collection.add(str2);\n        collection.add(str3);\n        collection.add(str4);\n        System.out.print("Collection Data: ");\n        iterator = collection.iterator();\n        while (iterator.hasNext()) {\n            System.out.print(iterator.next() + "");\n        }\n        System.out.println();\n        size = collection.size();\n        if (collection.isEmpty()) {\n            System.out.println("Collection is Empty");\n        } else {\n            System.out.println("Collection Length: " + size);\n        }\n        System.out.println();\n    }\n}

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The output of the above code is:

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Collection Instance!\nCollection Data: White Yellow Blue Green\nCollection Length: 4

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Java Examples