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Java Vector subList() Method | Rookie Tutorial

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Java Vector size() Method

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Java Vector toArray() Method

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Java Vector subList() Method

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Java Vector

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The Vector class is an important component of the Java Collections Framework, implementing dynamic array functionality. The subList() method is a utility method provided by the Vector class, used to extract a portion of elements from an existing Vector to form a new list view.

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Method syntax:

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\npublic List subList(int fromIndex, int toIndex)\n

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Parameter Description

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• fromIndex: The starting index of the sublist (inclusive)
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• toIndex: The ending index of the sublist (exclusive)
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Precautions

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1. Index values must satisfy 0 ≤ fromIndex ≤ toIndex ≤ size()
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2. If fromIndex and toIndex are equal, the returned sublist is empty
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3. Negative parameters or out-of-range values will throw IndexOutOfBoundsException
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Return Value Characteristics

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The subList() method returns a view of the original Vector, not an independent copy. This means:

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View Characteristics

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• Modifications to the sublist will directly affect the original Vector
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• Structural modifications to the original Vector (such as adding/removing elements) will invalidate the sublist
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• The sublist supports all list operations
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---

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Usage Example

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Example

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\nimport java.util.Vector;\nimport java.util.List;\n\npublic class VectorSubListExample {\n    public static void main(String[] args) {\n        // Create a Vector and add elements\n        Vector colors = new Vector();\n        colors.add("Red");\n        colors.add("Green");\n        colors.add("Blue");\n        colors.add("Yellow");\n        colors.add("Orange");\n        \n        System.out.println("Original Vector: " + colors);\n        \n        // Get sublist from index 1 (inclusive) to 4 (exclusive)\n        List subList = colors.subList(1, 4);\n        System.out.println("Sublist (1-4): " + subList);\n        \n        // Modify the sublist\n        subList.set(0, "Purple");\n        System.out.println("After modifying sublist: " + colors);\n        \n        // Clear the sublist\n        subList.clear();\n        System.out.println("After clearing sublist: " + colors);\n    }\n}\n

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Output:

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\nOriginal Vector: [Red, Green, Blue, Yellow, Orange]\nSublist (1-4): [Green, Blue, Yellow]\nAfter modifying sublist: [Red, Purple, Blue, Yellow, Orange]\nAfter clearing sublist: [Red, Orange]\n