如何搜索子字符串从原来的字符串

Question

String ORIGINAL = "This is my demo string"; 
String search = "demo"; 

我想要得到的结果为真或假，如果“演示”是退出原始则结果为true，否则返回false

Answer 1

if(ORIGINAL.contains(search)) 
    //found 
else 
    //not found