#include <vector> in Java

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#include <vector>
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There are two very different forms of using a vector, what we call the array idiom and the STL idiom In the array idiom, we mimic the use of the built-in array: we define a vector of a given size
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vector< int > ivec( 10 );
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This is analogous to defining a built-in array of ten elements, as follows:
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int ia[ 10 ];
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The subscript operator can be used to access the elements of a vector in the same way that we would access the elements of a built-in array For example:
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void simple_example()
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{ const int elem_size = 10; vector< int > ivec( elem_size ); int ia[ elem_size ]; for ( int ix = 0; ix < elem_size; ++ix ) ia[ ix ] = ivec[ ix ]; // }
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We can query a vector as to its size() or test whether it is empty() For example:
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void print_vector( vector<int> ivec ) { if ( ivecempty() ) return; for ( int ix = 0; ix < ivecsize(); ++ix ) cout ivec[ ix ] ' '; }
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The elements of a vector are initialized to the associated default value of the element type The default value of the arithmetic and pointer types is 0 For a class type, the default value is obtained by calling the default constructor (see Section 23 for an introduction of the default constructor) Alternatively, we can provide an explicit initial value for each element For example:
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vector< int > ivec( 10, -1 );
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defines ivec to contain ten elements of type int each initialized to -1 With a built-in array, we can explicitly initialize the elements of the array to a set of constant values For example:
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int ia[ 6 ] = { -2, -1, 0, 1, 2, 1024 };
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We cannot explicitly initialize a vector object in the same way However, we can initialize it to all or a portion of an existing array by specifying the address of the beginning and one past the last element of the array we wish to have the vector initialized with For example:
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// copies the 6 elements of ia into ivec vector< int > ivec( ia, ia+6 );
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The two pointers passed to ivec mark the range of values with which to initialize the object The second pointer always points one past the last element to be copied The range of elements marked can also represent a subset of the array For example:
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// copies 3 elements: ia[2], ia[3], ia[4] vector< int > ivec( &ia[ 2 ], &ia[ 5 ] );
Unlike a built-in array, a vector can be initialized with or assigned to another vector For example:
vector< string > svec; void init_and_assign() { // initializing one vector with another vector< string > user_names( svec ); // // copying one vector into another svec = user_names; }
In the STL idiom, a vector is used very differently Rather than define it with a given size, we define an empty vector:
[2] STL stands for Standard Template Library Prior to inclusion within Standard C++, the vector class, together with the generic algorithms, was part of stand-alone library known as the STL ([see MUSSER96])
vector< string > text;
Rather than index and assign to an element, we instead insert an element into the vector The push_back() operation, for example, inserts an element at the back of a vector The following while loop reads a sequence of strings from standard input, inserting them one at a time into the vector:
string word; while ( cin word ) { textpush_back( word ); // }
Although we can iterate across the elements using the subscript operator,
cout "words read are: \n"; for ( int ix = 0; ix < textsize(); ++ix ) cout text[ ix ] ' '; cout endl;
more typically we use the iterator pair returned by the begin() and end() set of vector operations:
cout "words read are: \n";
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