class Str2 {
	public static void main (String args[]) {
		String a = "1";
		a += "2";
		System.out.println(a);
	}
}


/* Expected Output:
12
*/

@@ -109,12 +109,203 @@
 );%0A%09
-%7D%0A
+%09System.out.println(%22abc%22.indexOf(%22%22, -32));%0A%09%09System.out.println(%22abc%22.indexOf(%22%22, 100));%0A%09%09System.out.println(%22abc%22.lastIndexOf(%22%22, -32));%0A%09%09System.out.println(%22abc%22.lastIndexOf(%22%22, 100));%0A%09
 %7D%0A
+%7D
 %0A%0A/*
@@ -325,11 +325,21 @@
 put:%0A12%0A
+0%0A-1%0A-1%0A3%0A
 */%0A

Add checks for indexOf() and lastIndexOf() with empty string arguments