「java两个数组的并集」java两个数组拼接
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java中怎么合并两个数组 简单明了的
int[] arr1 = {1,2,3,4,11};
int[] arr2 = {6,7,8,9,10};
int newLength = arr1.length + arr2.length;
int[] arr_target = new int[newLength];
//参数：源数组，源数组起始位置，目标数组，目标数组起始位置，复制长度
System.arraycopy(arr1, 0, arr_target, 0, arr1.length);
System.arraycopy(arr2, 0, arr_target, arr1.length, arr2.length);
//输出合并后数组
for (int i : arr_target) {
System.out.println(i);
}
//排序
Arrays.sort(arr_target);
//输出排序数组
for (int i : arr_target) {
System.out.println(i);
}
//逆序
int[] arr_reverse = new int[newLength];
int flag = 0;
for (int i : arr_target) {
arr_reverse[newLength - flag - 1] = i;
flag++;
}
//输出逆序数组
for (int i : arr_reverse) {
System.out.println(i);
}
数组合并不一定非得遍历
具体的输出题主自己再修改吧
在JAVA中如何求两个数组的并集
public static void main(String[] args)
{
Integer[] m = { 1, 2, 3, 4, 5 };
Integer[] n = { 3, 4, 6 };
Integer[] b = getB(m, n); for (Integer i : b)
{
System.out.println(i);
}
}
private static Integer[] getB(Integer[] m, Integer[] n)
{ // 将数组转换为set集合
SetInteger set1 = new HashSetInteger(Arrays.asList(m));
SetInteger set2 = new HashSetInteger(Arrays.asList(n)); // 合并两个集合 set1.addAll(set2);
Integer[] arr = {}; return set1.toArray(arr);
}
JAVA怎么合并两个数组
三种字符数组合并的方法
public static String[] getOneArray() {
String[] a = { "0", "1", "2" };
String[] b = { "0", "1", "2" };
String[] c = new String[a.length + b.length];
for (int j = 0; j a.length; ++j) {
c[j] = a[j];
}
for (int j = 0; j b.length; ++j) {
c[a.length + j] = b[j];
}
return c;
}
public static Object[] getTwoArray() {
String[] a = { "0", "1", "2" };
String[] b = { "0", "1", "2" };
List aL = Arrays.asList(a);
List bL = Arrays.asList(b);
List resultList = new ArrayList();
resultList.addAll(aL);
resultList.addAll(bL);
Object[] result = resultList.toArray();
return result;
}
public static String[] getThreeArray() {
String[] a = { "0", "1", "2", "3" };
String[] b = { "4", "5", "6", "7", "8" };
String[] c = new String[a.length + b.length];
System.arraycopy(a, 0, c, 0, a.length);
System.arraycopy(b, 0, c, a.length, b.length);
return c;
}
Reference:
Java中如何把两个数组合并为一个
import java.util.Arrays;
//Java中如何把两个数组合并为一个
public class gog {
public static void main(String[] args) {
String [] str1 = {"J","a","v","a","中"};
String [] str2 = {"如","何","把","两","个","数","组","合","并","为","一","个"};
int strLen1=str1.length;//保存第一个数组长度
int strLen2=str2.length;//保存第二个数组长度
str1= Arrays.copyOf(str1,strLen1+ strLen2);//扩容
System.arraycopy(str2, 0, str1, strLen1,strLen2 );//将第二个数组与第一个数组合并
System.out.println(Arrays.toString(str1));//输出数组
}
}
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