如何检查一个元素是否已经存在阵列中的

本文介绍了如何检查一个元素是否已经存在阵列中的的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我是从一个页面发送值到另一个，我想保存我甲肝发送的值，＆安培;然后要比较哪个我跟我甲肝已经发出一个发送的值，即保存value.while存储值到arrayin持久化对象，＆安培;然后用另一个阵列比较值，我面对一些概率，谁能告诉我如何检查值是否已经存在数组中，我给了code，好心帮

包com.firstBooks.series.db;进口了java.util.Random;进口net.rim.device.api.system.PersistentObject;进口net.rim.device.api.system.PersistentStore;进口net.rim.device.api.util.Arrays;进口net.rim.device.api.util.Persistable;进口com.firstBooks.series.db.parser.XMLParser;进口com.firstBooks.series.ui.managers.TopManager;进口com.firstBooks.series.ui.screens.TestScreen;公共类DBMain实现持久化{    公共静态字符串的回答=;    公共静态字符串selectedAnswer =;    公共静态问题curQuestion;    公共静态INT currQuesNumber = 1;    公共静态INT correctAnswerCount = -1;    静态INT curQuesnew;    静态INT quesCount = -1;    静态INT XYZ;    静态INT J = 0;    公共静态INT totalNumofQuestions = Question.totques;    公共静态INT quesNum [] =新的INT [XMLParser.questionList.size（）];    静态持久性对象qStore;    静态持久性对象curQues;    静态持久性对象pQues;    静态持久性对象curans;    静态持久性对象DISQUES;    静态持久性对象restques;    静态int类型的;    静态INT B：    静态INT [℃;    静态INT [] D;    静态INT pques;    静态INT罐;    静态INT [] dques;    静态INT [] rques;    静态的 {        qStore = PersistentStore.getPersistentObject（0x33010065d24c7883L）;        curQues = PersistentStore.getPersistentObject（0x33010064d24c7883L）;        pQues = PersistentStore.getPersistentObject（0xbd7460a5b4f9890aL）;        curans = PersistentStore.getPersistentObject（0xc5c065a3ae1bec21L）;        DISQUES = PersistentStore.getPersistentObject（0xbf8118045165a07aL）;    }    静态的{         初始化（）;    }    公共静态无效的initialize（）{        // INT quesNum [] =新的INT [XMLParser.questionList.size（）];        随机RGen元=新的随机（）; //随机数发生器        // int类型的=的Integer.parseInt（TopManager.quesNumber）;        AAAAAAA的//System.out.println(\"The值是......+一）;        // ---初始化数组        的for（int i = 0; I＆LT; quesNum.length;我++）{            quesNum [我] =我;        }        // ---每个元素随机交换洗牌        的for（int i = 0; I＆LT; quesNum.length;我++）{            INT randomPosition = rgen.nextInt（quesNum.length）;            INT TEMP = quesNum [I]            quesNum [I] = quesNum [randomPosition]            quesNum [randomPosition] =温度;        }            同步（qStore）{            qStore.setContents（quesNum）;        qStoremit（）;        }        }    公共静态INT getQuestionNumber（）{        // INT quesCount;           // quesCount ++;        //同步（curQues）{            // quesCount =的Integer.parseInt（（字符串）curQues.getContents（））;        //}            quesCount ++;           同步（curans）{                INT B =的Integer.parseInt（TopManager.corrCount）;                curans.setContents（B +）;                curansmit（）;            }    // INT quesNum [];        同步（qStore）{            quesNum =（INT []）qStore.getContents（）;            的System.out.println（问题的价值......+ quesNum.length）;    }        同步（pQues）{            int类型的=的Integer.parseInt（TopManager.quesNumber）;            pQues.setContents（A +）;            pQuesmit（）;        }        如果（quesNum = NULL＆放大器;！＆安培; quesCount＆LT; quesNum.length）{            同步（curQues）{                curQuesnew = quesNum [quesCount]                curQues.setContents（curQuesnew +）;                curQuesmit（）;            }            同步（DISQUES）{             C [J] = TestScreen.quesNumber;             的System.out.println（Astala vistaaaaaaaaaaaaa+ C）;                disques.setContents（C +）;                disquesmit（）;              }            同步（DISQUES）{                dques [J] =的Integer.parseInt（（字符串）disques.getContents（））;                的System.out.println（valueee是..........+ dques）;             }        对于（INT K = 0; K＆LT; dques.length; k ++）{         如果（quesNum [quesCount]！= dques [K]）{         的System.out.println（ghijyghfhgfhfhgfhgfhgfhgfhgddkjklmn）;          XYZ = quesNum [quesCount]         }         J ++;        }         返回XYZ;    }其他{            初始化（）;            quesCount = -1;            返回getQuestionNumber（）;        }    }    公共静态INT的get presentQuestionNumber（）{        同步（pQues）{            pques =的Integer.parseInt（（字符串）pQues.getContents（））;    }        返回pques; }  公共静态INT getCorrectanswerNumber（）{     同步（curans）{            罐=的Integer.parseInt（（字符串）curans.getContents（））;            }        返回罐; }  公共静态INT getCurrQuestionNumber（）{        同步（curQues）{            返回的Integer.parseInt（（字符串）curQues.getContents（））;            //返回curQuesnew;            // curQuesnew =（INT []）curQues.getContents（）;            //返回curQuesnew [quesCount]        }    }}

解决方案

要检查的一种方式，如果在数组中存在的值：

Arrays.asList（的someArray）。载有（值）;

i am sending value from one page to another,i want to store the values which i hav sent,& then want to compare the value which i am sending with the one which i hav already sent,i.e the saved value.while storing the values into an arrayin persistent object,& then comparing the value with another array,i face some prob,can anyone tell me how to check whether a value already exits in the array,i am giving the code,kindly help

package com.firstBooks.series.db; import java.util.Random; import net.rim.device.api.system.PersistentObject; import net.rim.device.api.system.PersistentStore; import net.rim.device.api.util.Arrays; import net.rim.device.api.util.Persistable; import com.firstBooks.series.db.parser.XMLParser; import com.firstBooks.series.ui.managers.TopManager; import com.firstBooks.series.ui.screens.TestScreen; public class DBMain implements Persistable{ public static String answer = ""; public static String selectedAnswer = ""; public static Question curQuestion; public static int currQuesNumber = 1; public static int correctAnswerCount = -1; static int curQuesnew; static int quesCount=-1; static int xyz; static int j=0; public static int totalNumofQuestions = Question.totques; public static int quesNum[] = new int[XMLParser.questionList.size()]; static PersistentObject qStore; static PersistentObject curQues; static PersistentObject pQues; static PersistentObject curans; static PersistentObject disques; static PersistentObject restques; static int a ; static int b; static int[] c ; static int[] d ; static int pques; static int cans; static int[] dques; static int[] rques; static { qStore = PersistentStore.getPersistentObject(0x33010065d24c7883L); curQues = PersistentStore.getPersistentObject(0x33010064d24c7883L); pQues = PersistentStore.getPersistentObject(0xbd7460a5b4f9890aL); curans = PersistentStore.getPersistentObject(0xc5c065a3ae1bec21L); disques = PersistentStore.getPersistentObject(0xbf8118045165a07aL); } static{ initialize(); } public static void initialize() { //int quesNum[] = new int[XMLParser.questionList.size()]; Random rgen = new Random(); // Random number generator //int a=Integer.parseInt(TopManager.quesNumber); //System.out.println("The value of AAAAAAA is...."+a); // --- Initialize the array for (int i = 0; i < quesNum.length; i++) { quesNum[i] = i; } // --- Shuffle by exchanging each element randomly for (int i=0; i< quesNum.length; i++) { int randomPosition = rgen.nextInt(quesNum.length); int temp = quesNum[i]; quesNum[i] = quesNum[randomPosition]; quesNum[randomPosition] = temp; } synchronized (qStore) { qStore.setContents(quesNum); qStoremit(); } } public static int getQuestionNumber() { //int quesCount; //quesCount++; //synchronized (curQues) { //quesCount = Integer.parseInt((String)curQues.getContents()); //} quesCount++; synchronized (curans) { int b=Integer.parseInt(TopManager.corrCount); curans.setContents(b+""); curansmit(); } //int quesNum[]; synchronized (qStore) { quesNum=(int[]) qStore.getContents(); System.out.println("The value of question is ...."+quesNum.length); } synchronized (pQues) { int a=Integer.parseInt(TopManager.quesNumber); pQues.setContents(a+""); pQuesmit(); } if (quesNum!=null && quesCount < quesNum.length) { synchronized (curQues) { curQuesnew=quesNum[quesCount]; curQues.setContents(curQuesnew+""); curQuesmit(); } synchronized (disques) { c[j]=TestScreen.quesNumber; System.out.println("Astala vistaaaaaaaaaaaaa"+c); disques.setContents(c+""); disquesmit(); } synchronized (disques) { dques[j]=Integer.parseInt((String)disques.getContents()); System.out.println("valueee is.........."+dques); } for(int k=0;k<dques.length;k++){ if(quesNum[quesCount]!=dques[k]){ System.out.println("ghijyghfhgfhfhgfhgfhgfhgfhgddkjklmn"); xyz=quesNum[quesCount]; } j++; } return xyz; } else { initialize(); quesCount = -1; return getQuestionNumber(); } } public static int getpresentQuestionNumber(){ synchronized (pQues) { pques=Integer.parseInt((String)pQues.getContents()); } return pques; } public static int getCorrectanswerNumber(){ synchronized (curans) { cans=Integer.parseInt((String)curans.getContents()); } return cans; } public static int getCurrQuestionNumber() { synchronized (curQues) { return Integer.parseInt((String)curQues.getContents()); //return curQuesnew; //curQuesnew=(int[]) curQues.getContents(); //return curQuesnew[quesCount]; } } }

解决方案

One way to check if a value exists in an array:

Arrays.asList(someArray).contains(value);