为什么这个Java类无法编译

Question

Why does the below java code compilation result in an error? I'm using java 8, if that matters.

public class SimpleTest {

      private static boolean isPresent(int []... arrays, int number){

          boolean isPresent = true;

          for(int i=0;i<arrays.length;i++){
              //isPresent = doBinarySearch(arrays[i], number);
              if(!isPresent){
                  break;
              }
          }

          return isPresent;
      }    
}

And here is the error I am getting:

SimpleTest.java:3: error: ')' expected
  private static boolean isPresent(int []... arrays, String number){
                                                   ^
SimpleTest.java:3: error: ';' expected
  private static boolean isPresent(int []... arrays, String number){
                                                                  ^
2 errors

Answer 1

Varargs can only be declared as the last parameter.

You can use a construct called varargs to pass an arbitrary number of values to a method. You use varargs when you don't know how many of a particular type of argument will be passed to the method. It's a shortcut to creating an array manually.

To use varargs, you follow the type of the last parameter by an ellipsis (three dots, ...), then a space, and the parameter name. The method can then be called with any number of that parameter, including none.

( Source )

Answer 2

This should work :

private static boolean isPresent(int []arrays, int number) {
...
}