e340. converting a collection to an array.txt

来自「这里面包含了一百多个JAVA源文件」· 文本 代码 · 共 16 行

// Create an array containing the elements in a list
    Object[] objectArray = list.toArray();
    MyClass[] array = (MyClass[])list.toArray(new MyClass[list.size()]);
    
    // Create an array containing the elements in a set
    objectArray = set.toArray();
    array = (MyClass[])set.toArray(new MyClass[set.size()]);
    
    // Create an array containing the keys in a map
    objectArray = map.keySet().toArray();
    array = (MyClass[])map.keySet().toArray(new MyClass[set.size()]);
    
    // Create an array containing the values in a map
    objectArray = map.values().toArray();
    array = (MyClass[])map.values().toArray(new MyClass[set.size()]);