怎么把数组放到set里

1. 对象数组如何set值并加到对象里面

1、获取到数组数据dataArray

2、定义存放数组元素的对象，比如List<String> dataList

3、遍历数组dataArry，可以直接for循环或者for(String s : dataArray)

4、获取数组dataArray中的每一条数据放入dataList。

示例：

String[] dataArray = new String[]{"123","234","345"};

List<String> dataList = new ArrayList<String>();

for(String s : dataArray){

dataList.add(s);

}

2. java 将int类型数组存入Set集合中

因为arr1 == arr2 ---.> falseHashSet，你这个很难实现的，用TreeSet然后重写compareTo可以实现通过Set来驱重 TreeSet实现方案import java.util.Arrays;import java.util.Iterator;import java.util.Set;import java.util.TreeSet;public class Ts { public static void main(String[] args) { int[] arr1 = { 10, 12, 15 }; int[] arr2 = { 10, 12, 15 }; IntAry ary1 = new IntAry(arr1); IntAry ary2 = new IntAry(arr2); Set set = new TreeSet(); set.add(ary1); set.add(ary2); Iterator ite = set.iterator(); while (ite.hasNext()) { System.out.println(Arrays.toString(((IntAry)ite.next()).getAry())); } }}class IntAry implements Comparable{ private int[] ary = null; public IntAry(int[] ary){ this.ary = ary; } public int[] getAry(){ return ary; } public int compareTo(IntAry obj) { int[] o = obj.getAry(); if(o.length != ary.length){ return -1; } for(int i = 0; i < ary.length; i++){ if(ary[i] != o[i]){ return -1; } } return 0; } //HashSet, seems impossible// public int hashCode() {// // return super.hashCode();// }// }。

3. int[]a={1.2.3.4.5.6.7.8.9.10}将数组内容存放到java.util.set里

package sadf; import java.util.ArrayList; import java.util.HashMap; import java.util.HashSet; import java.util.List; import java.util.Map; import java.util.Set; import java.util.UUID; public class TestJava { public static int[] a ={1,2,3,4,5,6,7,8,9,10};// int[]a={1.2.3.4.5.6.7.8.9.10}将数组内容存放到java.util.set里// 再java.util.set内容放java.util.List里，再java.tuil.List内容放java.util.Map里（key用UUID）// key,value// key,value public static Set arrayToSet(int[] array){ Set set = new HashSet(); if(array == null || array.length == 0){ return set; } for(int i= 0;i setToList(Set set){ List list = new ArrayList(); if(set == null || set.size() == 0){ return list; } for(Integer number : set){ list.add(number); } return list; } public static Map listToMap(List list){ Map map = new HashMap(); if(list == null || list.size() == 0){ return map; } for(Integer number : list){ UUID key = UUID.randomUUID(); map.put(key, number); } return map； } public static void main(String args []){ Set set = TestJava.arrayToSet(a); List list = TestJava.setToList(set); Map map = listToMap(list); System.out.println(set); System.out.println(list); System.out.println(map); } }package sadf; import java.util.ArrayList; import java.util.HashMap; import java.util.HashSet; import java.util.List; import java.util.Map; import java.util.Set; import java.util.UUID; public class TestJava { public static int[] a ={1,2,3,4,5,6,7,8,9,10};// int[]a={1.2.3.4.5.6.7.8.9.10}将数组内容存放到java.util.set里// 再java.util.set内容放java.util.List里，再java.tuil.List内容放java.util.Map里（key用UUID）// key,value// key,value public static Set arrayToSet(int[] array){ Set set = new HashSet(); if(array == null || array.length == 0){ return set; } for(int i= 0;i setToList(Set set){ List list = new ArrayList(); if(set == null || set.size() == 0){ return list; } for(Integer number : set){ list.add(number); } return list; } public static Map listToMap(List list){ Map map = new HashMap(); if(list == null || list.size() == 0){ return map; } for(Integer number : list){ UUID key = UUID.randomUUID(); map.put(key, number); } return map； } public static void main(String args []){ Set set = TestJava.arrayToSet(a); List list = TestJava.setToList(set); Map map = listToMap(list); System.out.println(set); System.out.println(list); System.out.println(map); } }。

4. 怎样将数组放在arraylist中

a.jsp页面List all=new ArrayList();String[] a=new String[10]; String[] b=new String[10]; String[] c=new String[10]; all.add(a);all.add(b);all.add(c);session.setAttribute("allArrayList",all);b.jsp页面ArrayList all= (ArrayList)session.getAttribute("allArrayList");String[] a=(String[])all.get(0);String[] b=(String[])all.get(1);String[] c=(String[])all.get(2);。