find longest common prefix in java

longestCommonPrefix.java

@@ -0,0 +1,39 @@
+class Solution {
+    public String longestCommonPrefix(String[] strs) {
+        int  minlength = 201;
+
+        for(int a=0;a <strs.length;a++){
+            String s = strs[a];
+            minlength = Math.min(minlength, s.length());
+        }
+        // System.out.println(minlength);
+
+                String st = "";
+                int count = 0;
+           while (count<= minlength){
+            for (int b=0; b<strs.length; b++){
+                if(count< minlength){
+                    char tt =strs[0].charAt(count);
+                    if(strs[b].charAt(count) != tt){
+                        st = strs[0].substring(0, count);
+                        System.out.println(st);
+                        return st;
+                    }    
+
+                     }
+                 else if(count == minlength){ 
+                     System.out.println(count);
+                     System.out.println(minlength);
+                     return st = strs[0].substring(0, count);
+                   }
+
+
+              }
+               // System.out.println(count);
+               count++;
+           }
+
+
+        return st;
+    }
+}