java入門數(shù)組題目及答案1.題目：求數(shù)組中的最大值和最小值```javapublicclassArrayMaxMin{publicstaticvoidmain(String[]args){int[]array={3,5,1,8,4,7,2};intmax=array[0];intmin=array[0];for(inti=1;i<array.length;i++){if(array[i]>max){max=array[i];}if(array[i]<min){min=array[i];}}System.out.println("最大值："+max);System.out.println("最小值："+min);}}```答案：程序輸出數(shù)組中的最大值和最小值。2.題目：求數(shù)組中所有元素的和```javapublicclassArraySum{publicstaticvoidmain(String[]args){int[]array={3,5,1,8,4,7,2};intsum=0;for(inti=0;i<array.length;i++){sum+=array[i];}System.out.println("數(shù)組元素的和："+sum);}}```答案：程序輸出數(shù)組中所有元素的和。3.題目：反轉(zhuǎn)數(shù)組```javapublicclassReverseArray{publicstaticvoidmain(String[]args){int[]array={3,5,1,8,4,7,2};int[]reversedArray=newint[array.length];for(inti=0;i<array.length;i++){reversedArray[i]=array[array.length-1-i];}System.out.print("反轉(zhuǎn)后的數(shù)組：");for(inti=0;i<reversedArray.length;i++){System.out.print(reversedArray[i]+"");}}}```答案：程序輸出反轉(zhuǎn)后的數(shù)組。4.題目：數(shù)組元素排序（升序）```javapublicclassArraySort{publicstaticvoidmain(String[]args){int[]array={3,5,1,8,4,7,2};for(inti=0;i<array.length-1;i++){for(intj=0;j<array.length-1-i;j++){if(array[j]>array[j+1]){inttemp=array[j];array[j]=array[j+1];array[j+1]=temp;}}}System.out.print("升序排序后的數(shù)組：");for(inti=0;i<array.length;i++){System.out.print(array[i]+"");}}}```答案：程序輸出升序排序后的數(shù)組。5.題目：數(shù)組元素去重```javaimportjava.util.HashSet;importjava.util.Set;publicclassArrayRemoveDuplicates{publicstaticvoidmain(String[]args){int[]array={3,5,1,8,4,7,2,5,3};Set<Integer>set=newHashSet<>();for(inti=0;i<array.length;i++){set.add(array[i]);}int[]uniqueArray=newint[set.size()];intindex=0;for(intnum:set){uniqueArray[index++]=num;}System.out.print("去重后的數(shù)組：");for(inti=0;i<uniqueArray.length;i++){System.out.print(uniqueArray[i]+"");}}}```答案：程序輸出去重后的數(shù)組。6.題目：找出數(shù)組中出現(xiàn)次數(shù)最多的元素```javaimportjava.util.HashMap;importjava.util.Map;publicclassMostFrequentElement{publicstaticvoidmain(String[]args){int[]array={3,5,1,8,4,7,2,5,3,3};Map<Integer,Integer>frequencyMap=newHashMap<>();for(inti=0;i<array.length;i++){frequencyMap.put(array[i],frequencyMap.getOrDefault(array[i],0)+1);}intmaxFrequency=0;intmostFrequentElement=array[0];for(Map.Entry<Integer,Integer>entry:frequencyMap.entrySet()){if(entry.getValue()>maxFrequency){maxFrequency=entry.getValue();mostFrequentElement=entry.getKey();}}System.out.println("出現(xiàn)次數(shù)最多的元素："+mostFrequentElement);}}```答案：程序輸出數(shù)組中出現(xiàn)次數(shù)最多的元素。7.題目：數(shù)組中兩個數(shù)的和等于特定值```javapublicclassTwoSum{publicstaticvoidmain(String[]args){int[]array={3,5,1,8,4,7,2};inttargetSum=9;for(inti=0;i<array.length;i++){for(intj=i+1;j<array.length;j++){if(array[i]+array[j]==targetSum){System.out.println("兩個數(shù)的和等于"+targetSum+"的數(shù)是："+array[i]+"和"+array[j]);return;}}}System.out.println("沒有找到兩個數(shù)的和等于"+targetSum);}}```答案：程序輸出數(shù)組中兩個數(shù)的和等于特定值的數(shù)。8.題目：找出數(shù)組中的奇數(shù)和偶數(shù)```javapublicclassOddEvenNumbers{publicstaticvoidmain(String[]args){int[]array={3,5,1,8,4,7,2};intoddCount=0;intevenCount=0;for(inti=0;i<array.length;i++){if(array[i]%2==0){evenCount++;}else{oddCount++;}}System.out.println("奇數(shù)個數(shù)："+oddCount);System.out.println("偶數(shù)個數(shù)："+evenCount);}}```答案：程序輸出數(shù)組中奇數(shù)和偶數(shù)的個數(shù)。9.題目：找出數(shù)組中所有素數(shù)```javapublicclassPrimeNumbers{publicstaticvoidmain(String[]args){int[]array={3,5,1,8,4,7,2};boolean[]isPrime=newboolean[array.length];for(inti=0;i<array.length;i++){isPrime[i]=isPrime(array[i]);}System.out.print("數(shù)組中的素數(shù)：");for(inti=0;i<array.length;i++){if(isPrime[i]){System.out.print(array[i]+"");}}}publicstaticbooleanisPrime(intnum){if(num<=1){returnfalse;}for(inti=2;ii<=num;i++){if(num%i==0){returnfalse;}}returntrue;}}```答案：程序輸出數(shù)組中的所有素數(shù)。10.題目：找出數(shù)組中的負(fù)數(shù)```javapublicclassNegativeNumbers{publicstaticvoidmain(String[]args){int[]