Web design portfolio - 1194 Java Utilities Package and Bit Manipulation Chapter
1194 Java Utilities Package and Bit Manipulation Chapter 20 of setting its bit to off with BitSet method clear. The number 3 is divisible by 1 and itself. Therefore, we can eliminate all multiples of 3 (keep in mind that all even numbers have already been eliminated). After the list of primes is displayed, the user can type a value from 2 to 1023 in the textfield and press enter to determine whether the number is prime. Method actionPerformed (lines 42 53) uses BitSet method get (line 46) to determine whether the bit for the number the user entered is set. If so, lines 47 48 display a message indicating that the number is prime. Otherwise, lines 51 52 display a message indicating that the number is not prime. SUMMARY Class Vector manages dynamically resizable arrays. At any time the Vector contains a certain number of elements which is less than or equal to its capacity. The capacity is the space that has been reserved for the array. If a Vector needs to grow, it grows by an increment that you specify or by a default assumed by the system. If you do not specify a capacity increment, the system automatically doubles the size of the Vector each time additional capacity is required. Vectors store references to Objects. To store values of primitive data types in Vectors, use the type-wrapper classes (Byte, Short, Integer, Long, Float, Double, Boolean and Character) to create objects containing the primitive data type values. Class Vector provides three constructors. The no-argument constructor creates an empty Vector. The constructor that takes one argument creates a Vector with an initial capacity specified by the argument. The constructor that takes two arguments creates a Vector with an initial capacity specified by the first argument and a capacity increment specified by the second argument. Vector method addElement adds its argument to the end of the Vector. Method insertElementAt inserts an element at the specified position. Method setElementAt sets the element at a specific position. Vector method removeElement removes the first occurrence of its argument. Method removeAllElements removes every element from the Vector. Method removeElementAt removes the element at the specified index. Vector method firstElement returns a reference to the first element. Method lastElement returns a reference to the last element. Vector method isEmptydetermines whether the Vector is empty. Vector method containsdetermines whether the Vector contains the searchKey specified as an argument. Vector method indexOf gets the index of the first location of its argument. The method returns 1 if the argument is not found in the Vector. Vector method trimToSize cuts the capacity of the Vector to the Vector s size. Methods sizeand capacity determine the number of elements currently in the Vector and the number of elements that can be stored in the Vector without allocating more memory, respectively. Vector method elements returns a reference to an Enumeration containing the elements of the Vector. Enumeration method hasMoreElements determines whether there are more elements. Method nextElement returns a reference to the next element. Class Stack extends class Vector. Stack method push adds its argument to the top of the stack. Method popremoves the top element of the stack. Method peek returns an Object ref
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