public class Sample09 {public static void main(String[] args) {String txt = "HelloWorld";System.out.println("The length of the txt string is:" + txt.length());System.out.println(txt.toUpperCase());System.out.println(txt.toLowerCase());System.out.println(txt.indexOf("World"));String firstName = "Chen";String lastName = "Haipeng";System.out.println(firstName + " " + lastName);System.out.println(firstName.concat(lastName));String txt1 = "We are the so-called \"Vikings\" from the north.";String txt2 = "It\'s alright";String txt3 = "The character \\ is called backslash.";System.out.println(txt1);System.out.println(txt2);System.out.println(txt3);}}
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