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String str = "Example String";
char ch = 'e';
boolean containsChar = str.indexOf(ch) != -1;
System.out.println("Does the string contain the character? " + containsChar);
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String text = "Hello, World!";
String substring = "World";
boolean containsSubstring = text.contains(substring);
System.out.println("Substring found: " + containsSubstring);