Added 435 Non-Overlapping Intervals Java Solution

java/435-Non-Overlapping-Intervals.java

@@ -0,0 +1,28 @@
+public class Solution {
+    public int eraseOverlapIntervals(int[][] intervals) {
+		int intervalsRemoved = 0;
+
+		Arrays.sort(intervals, (arr1,arr2) -> Integer.compare(arr1[0], arr2[0]));
+
+		int[] intervalFirst = intervals[0];
+
+		for(int i = 1; i < intervals.length; i++){
+			if(firstIntervalwithinSecond(intervalFirst, intervals[i])){
+				//mark first interval to be removed
+				intervalsRemoved++;
+				// determine which interval to remove
+				//remove the interval that ends last
+				if(intervalFirst[1] > intervals[i][1]){
+					intervalFirst = intervals[i];
+				}
+			} else { 
+				intervalFirst = intervals[i];
+			}
+		}
+		return intervalsRemoved;
+	}
+
+	public boolean firstIntervalwithinSecond(int[] intervalFirst, int[] intervalSecond){
+		return intervalSecond[0] < intervalFirst[1];
+	}
+}