我需要在Java中连接两个字符串数组。
void f(String[] first, String[] second) {
String[] both = ???
}
哪种方法最简单?
我需要在Java中连接两个字符串数组。
void f(String[] first, String[] second) {
String[] both = ???
}
哪种方法最简单?
当前回答
您可以尝试连接多个数组的方法:
public static <T> T[] concatMultipleArrays(T[]... arrays)
{
int length = 0;
for (T[] array : arrays)
{
length += array.length;
}
T[] result = (T[]) Array.newInstance(arrays.getClass().getComponentType(), length) ;
length = 0;
for (int i = 0; i < arrays.length; i++)
{
System.arraycopy(arrays[i], 0, result, length, arrays[i].length);
length += arrays[i].length;
}
return result;
}
其他回答
这是可行的,但您需要插入自己的错误检查。
public class StringConcatenate {
public static void main(String[] args){
// Create two arrays to concatenate and one array to hold both
String[] arr1 = new String[]{"s","t","r","i","n","g"};
String[] arr2 = new String[]{"s","t","r","i","n","g"};
String[] arrBoth = new String[arr1.length+arr2.length];
// Copy elements from first array into first part of new array
for(int i = 0; i < arr1.length; i++){
arrBoth[i] = arr1[i];
}
// Copy elements from second array into last part of new array
for(int j = arr1.length;j < arrBoth.length;j++){
arrBoth[j] = arr2[j-arr1.length];
}
// Print result
for(int k = 0; k < arrBoth.length; k++){
System.out.print(arrBoth[k]);
}
// Additional line to make your terminal look better at completion!
System.out.println();
}
}
它可能不是最有效的,但除了Java自己的API之外,它不依赖其他任何东西。
我刚刚发现了这个问题,很抱歉,很晚了,我看到了很多太遥远的答案,使用某些库,使用将数据从数组转换为流并返回到数组等功能。但是,我们只需要使用一个简单的循环,问题就解决了
public String[] concat(String[] firstArr,String[] secondArr){
//if both is empty just return
if(firstArr.length==0 && secondArr.length==0)return new String[0];
String[] res = new String[firstArr.length+secondArr.length];
int idxFromFirst=0;
//loop over firstArr, idxFromFirst will be used as starting offset for secondArr
for(int i=0;i<firstArr.length;i++){
res[i] = firstArr[i];
idxFromFirst++;
}
//loop over secondArr, with starting offset idxFromFirst (the offset track from first array)
for(int i=0;i<secondArr.length;i++){
res[idxFromFirst+i]=secondArr[i];
}
return res;
}
就这样,对吧?他没有说他关心订单或任何事情。这应该是最简单的方法。
在Java 8中
public String[] concat(String[] arr1, String[] arr2){
Stream<String> stream1 = Stream.of(arr1);
Stream<String> stream2 = Stream.of(arr2);
Stream<String> stream = Stream.concat(stream1, stream2);
return Arrays.toString(stream.toArray(String[]::new));
}
public String[] concat(String[]... arrays)
{
int length = 0;
for (String[] array : arrays) {
length += array.length;
}
String[] result = new String[length];
int destPos = 0;
for (String[] array : arrays) {
System.arraycopy(array, 0, result, destPos, array.length);
destPos += array.length;
}
return result;
}
我使用下一个方法使用java8连接任意数量的相同类型的数组:
public static <G> G[] concatenate(IntFunction<G[]> generator, G[] ... arrays) {
int len = arrays.length;
if (len == 0) {
return generator.apply(0);
} else if (len == 1) {
return arrays[0];
}
int pos = 0;
Stream<G> result = Stream.concat(Arrays.stream(arrays[pos]), Arrays.stream(arrays[++pos]));
while (pos < len - 1) {
result = Stream.concat(result, Arrays.stream(arrays[++pos]));
}
return result.toArray(generator);
}
用法:
concatenate(String[]::new, new String[]{"one"}, new String[]{"two"}, new String[]{"three"})
or
concatenate(Integer[]::new, new Integer[]{1}, new Integer[]{2}, new Integer[]{3})