isSubstring???

public class Aufgabe4
{
public static void main(String[] args)
{
/* Test */
//String str0 = "", str1 = "";
//String str0 = "", str1 = "cool";
//String str0 = "OOPI find ich cool!", str1 = "";
//String str0 = "OOPI find ich cool!", str1 = "cool";
//String str0 = "OOPI find ich cool!", str1 = "OOPI find ich cool!";
String str0 = "OOPI find ich cool!", str1 = "find ich doof";

if(isSubstring(str0, str1))...

isSubstring???

isSubstring???