Java determines whether an array contains an element
One: Use List
public static boolean useList(String[] arr, String targetValue) {
return Arrays.asList(arr).contains(targetValue);
} Two: Use Set
public static boolean useSet(String[] arr, String targetValue) {
Set<String> set = new HashSet<String>(Arrays.asList(arr));
return set.contains(targetValue);
} Three: Use loop judgment
public static boolean useLoop(String[] arr, String targetValue) {
for(String s: arr){
if(s.equals(targetValue))
return true;
}
return false;
}Four: Use Arrays.binarySearch()
Arrays.binarySearch()The method can only be used for ordered arrays! ! ! If the array is unordered, the results will be strange.
The usage of finding whether an ordered array contains a certain value is as follows:
public static boolean useArraysBinarySearch(String[] arr, String targetValue) {
int a = Arrays.binarySearch(arr, targetValue);
if(a > 0)
return true;
else
return false;
}Recommended tutorial: java quick start
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