java arraylist example

-Wxhm.put ("The Pride of the lake", array1); AWxhm.put ("The Condor Man", array2); + the //Add a collection of martial arts novels to the collection -Hm1.put ("Martial arts Fiction", WXHM); $ the //Traverse the the //get a collection of keys for a novel collection theSetHm1.keyset (); - //Traverse in for(String hm1key:hm1set) { the //the value of the novel collection is Hashmap theHashmapHm1.get (hm1key); About

/*** ArrayList Collection Explanation* Add, Traverse, delete of collection*/Package com.test;Import java.util.*;public class Test7 {/*** @param args*/public static void Main (string[] args) {TODO auto-generated Method StubAdd first employeeClerk CLERK1 = new Clerk ();Clerk1.setname ("Kim");Clerk1.setage (18);Clerk1.setsalary (1000.00F);Add a second employeeClerk CLERK2 = new Clerk ();Clerk2.setname ("Ross");Clerk2.setage (19);Clerk2.setsalary (2000.00

Array Array (array) and vector are very similar Java artifacts (constructs), which are completely different and should be determined according to their functions when choosing to use them. 1, array: Java arrays elements can not be subscript out of bounds, to a large extent, to ensure the security of Java programs, and other languages appear this problem often lea

(listTester[] Testers={inserttester,iteratester,gettester,removetester};Test (testers,list);}private static void Test (tester[] testers, listfor (int i=0;iSystem.out.print (testers[i].getoperation () + "Operation:");Long T1=system.currenttimemillis ();Testers[i].test (list);Long T2=system.currenttimemillis ();System.out.print (t2-t1+ "MS");System.out.println ();}}public static void Main (string[] args) {ListTesting the Java arraySYSTEM.OUT.PRINTLN ("

The introduction of related packages, the package used here is net.sf.json-lib:json-lib:2.4, but the introduction of a bit of a pit, the package has two versions, jdk1.5 and jdk1.4, the introduction of the time to add the corresponding JDK version number, or not to introduce success.Gradle is used here, so add a line in the dependenciesCompile "net.sf.json-lib:json-lib:2.4:jdk15"If you write compile "net.sf.json-lib:json-lib:2.4", then you cannot introduce success.The following code shows how to

stored at the end of the array, and the insertion is inserted at any position.Pros and Cons Analysis:Advantages: No additional storage space is added to represent the logical relationship between the data elements in the table; You can quickly access elements from anywhere in the table.Disadvantages: Insert and delete operations require a large number of elements to be moved; When the length of linear table changes greatly, it is difficult to determine the capacity of stora

The following is an implementation of the ArrayList generic class. To avoid confusion with classes in the class library named myArrayList, the main details are: The member variable contains the underlying array, the array capacity, and the current number of items stored in the myarraylist. Provides a mechanism to change the capacity of the underlying array. By getting a new array, copy the old array to the new array to change the capacity

Object get (int index) {if (indexSystem.out.println ("Index exceeds the maximum index value or index is less than 0");return null;}return Elementdata[index];}Delete the value of the corresponding indexPublic Object Remove (int index) {if (Index System.out.println ("Index less than 0, or out of bounds");System.exit (0);}Object OldValue = this.get (index);System.arraycopy (elementdata, index + 1,elementdata, index, size);elementdata[size--] = null;return oldValue;}Pick up the values in the corres

Requirement: ArrayList stores custom objects and iterates through them. Requires generics to be joined and enhanced for traversal.A: iteratorsB: General forC: Enhanced forLinkedlist,vector,colleciton,list and other storage continue to practiceThe enhanced for is used to replace iterators.1 Packagecn_jdk5new;2 3 Importjava.util.ArrayList;4 ImportJava.util.Iterator;5 6 7 Public classArrListDemo2 {8 Public Static voidMain (string[] args) {9 //Create a

) {int capacity = (value.length object[] NewList = new Object[capacity];for (int i=0;iNewlist[i] = Value[i];}value = NewList;}}Public Object getvalue (int index) {if (indexRangecheck ();}return Value[index];}public static void Main (string[] args) {myArrayList a = new myarraylist (2);A.input ("ABCD");A.input (New Human ("is ME");A.input ("123456");A.input ("123456");A.input ("123456");A.input ("123456");A.input ("123456");Human me = (Human) a.getvalue (1);System.out.println (Me.getname ());Syste

Define a person's class, save the ArrayList collection, remove the duplicate elements, define: The same name and age are the same as the repeating element.Take weightpublic class Qu {public static void Main (string[] args) {Sa2 a = new Sa2 ("Zhang San", 20);SA2 A1 = new Sa2 ("Zhang San", 30);SA2 a3 = new Sa2 ("Zhang San", 20);arraylistList.add (a);List.add (A1);List.add (A3);ArraylistSystem.out.println (List1);}public static arraylistArraylistListiter

Overview1, List features: linear sequential storage elements, elements can be duplicated, can be stored null2, ArrayList, LinkedListFirst, list featuresAs shown in this diagram, the list is stored in a linear structure , so it can be repeated or null. Of course, the specific sub-class is how to achieve, each has its own form.Second, the method of the listMost of these are not explained in the same way as the introduction of collection interfaces. Only

(); Em.showinfo (EmpNo); } Else if(Opertype.equals ("3")){ } Else if(Opertype.equals ("4")){ } } }}classemp{PrivateString EmpNo; PrivateString name; Private floatSal; PublicEMP (String empno,string name,floatSal) { This. empno=EmpNo; This. name=name; This. sal=Sal; } PublicString Getempno () {returnEmpNo; } Public voidsetempno (String empNo) { This. EmpNo =EmpNo; } PublicString Ge

importjava.util.arraylist;importjava.util.linkedhashset;publicclassmainclass{ publicstaticvoidmain (String[]args) { //ConstructingAnArrayListArrayList Java to the elements in the ArrayList and the order of the same

Import java.util.ArrayList;Import Java.util.Iterator;Import java.util.List;public class Arraylistdemo {publicstatic void Main (String args[]) {listList.add ("Luojiahui");List.add ("Luojiafeng");Method 1Iterator it1 = List.iterator ();while (It1.hasnext ()) {System.out.println (It1.next ());}Method 2for (Iterator it2 = List.iterator (); It2.hasnext ();) {System.out.println (It2.next ());}Method 3for (String tmp:list) {SYSTEM.OUT.PRINTLN (TMP);}Method 4for (int i = 0;i System.out.println (List.get

public class Myarraylist　　Self-made data structures (containers)-java development with the most ArrayList and HashMap

(M2.getcdate ()))return 1;if (M.getcdate (). Equals (M2.getcdate ()))return 0;if (M.getcdate (). Before (M2.getcdate ()))return-1;}else if (O1 instanceof Message O2 instanceof Checkrecord) {Message m= (message) O1;Checkrecord m2= (Checkrecord) O2;if (M.getmessagedate (). After (M2.getcdate ()))return 1;if (M.getmessagedate (). Equals (M2.getcdate ()))return 0;if (M.getmessagedate (). Before (M2.getcdate ()))return-1;}return 0;}Write a log not easy, reprint please indicate source: http://blog.c