diff --git a/08_String/prb.class b/08_String/prb.class
new file mode 100644
index 0000000..2c762dc
Binary files /dev/null and b/08_String/prb.class differ
diff --git a/08_String/prb.java b/08_String/prb.java
new file mode 100644
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--- /dev/null
+++ b/08_String/prb.java
@@ -0,0 +1,22 @@
+public class prb {
+    public static String getFre(String str){
+        int fre[]= new int[26];
+        for(char ch : str.toCharArray()){
+            fre[ch-'a']++;
+        }
+
+        StringBuilder sb = new StringBuilder("");
+        char c = 'a';
+        for(int i : fre){
+            sb.append(c);
+            sb.append(i);
+            c++;
+        }
+        return sb.toString();
+    
+    }
+    public static void main(String[] args) {
+        String strs = "aabbc";
+        System.out.println(getFre(strs));
+    }
+}