IN JAVA

Implement a method that receives an array of integers and returns true if the following conditions are all satisfied:

• the array consists of +1 and -1 only,
• the sum of all array elements is 0,
• and the sum of elements in each prefix of the array is non-negative (a prefix of an array with n elements consists of the elements with indexes from 0 to some i < n);

the method should return false otherwise.