检查字符串是否包含特定单词

并不像他们所说的那么复杂，选中此选项您不会后悔。

String sentence = "Check this answer and you can find the keyword with this pre";String search  = "keyword";if ( sentence.toLowerCase().indexOf(search.toLowerCase()) != -1 ) {   System.out.println("I found the keyword");} else {   System.out.println("not found");}

您可以

toLowerCase()