class Str2 {
	public static void main (String args[]) {
		String a = "1";
		a += "2";
		System.out.println(a);
		System.out.println("abc".indexOf("", -32));
		System.out.println("abc".indexOf("", 100));
		System.out.println("abc".lastIndexOf("", -32));
		System.out.println("abc".lastIndexOf("", 100));
	}
}

/* Expected Output:
12
0
-1
-1
3
*/

@@ -136,34 +136,40 @@
 c%22.indexOf(%22%22, -
-32
+99999999
 ));%0A%09%09System.out
@@ -191,27 +191,109 @@
 indexOf(%22%22, 
-100
+99999999));%0A%09%09System.out.println(%22%22.indexOf(%22a%22));%0A%09%09System.out.println(%22%22.indexOf(%22%22
 ));%0A%09%09System
@@ -332,10 +332,16 @@
 %22, -
-32
+99999999
 ));%0A
@@ -387,11 +387,101 @@
 %22%22, 
-100
+99999999));%0A%09%09System.out.println(%22%22.lastIndexOf(%22a%22));%0A%09%09System.out.println(%22%22.lastIndexOf(%22%22
 ));%0A
@@ -521,9 +521,19 @@
 %0A-1%0A
-3
+0%0A-1%0A3%0A-1%0A0
 %0A*/%0A

Add a couple more tests.