revise it to my own one.(I got a example)

xxx.java public class xxx { public static void main(String[] args) { TripleString t1 = new TripleString(); //default constuctor TripleString t2 = new TripleString("one", "two", "three"); //valid values in parameterizied constructor TripleString t3 = new TripleString(null, "", "xyz"); //invalid values for 2 parameters TripleString t4 = new TripleString(null, null, null); //invalid parameters for all 3 System.out.println("Displaying the 4 triple strings created using different constructors"); System.out.println("t1 using default constructor : \n" + t1); System.out.println("t2 with all valid values: \n" + t2); System.out.println("t3 with 2 parameters invalid: \n" + t3); System.out.println("t4 with all invalid parameters: \n" + t4); //mutate all objects System.out.println("\nUsing mutators to change each of the objects"); t1.setString1("potato"); t2.setString2("four"); t3.setString3("chips"); t4.setString1("pen"); System.out.println("t1: " + t1); System.out.println("t2: " + t2); System.out.println("t3: " + t3); System.out.println("t4: " + t4); System.out.println(); //explicit test if(t3.setString1("watermelon")) System.out.println("t3.setString1(\"watermelon\") was succesful"); else System.out.println("t3.setString1(\"watermelon\") was NOT succesful"); if(t3.setString3("")) System.out.println("t3.setString1(\"\") was succesful"); else System.out.println("t3.setString1(\"\") was NOT succesful"); System.out.println("t2.getString1() = " + t2.getString1()); System.out.println("t2.getString2() = " + t2.getString2()); } } class TripleString { private String string1; private String string2; private String string3; public static final int MIN_LEN = 1; public static final int MAX_LEN = 50; public static final String DEFAULT_STRING = " (undefined) "; public TripleString() { string1 = DEFAULT_STRING; string2 = DEFAULT_STRING; string3 = DEFAULT_STRING; } public TripleString(String s1, String s2, String s3) { if(!setString1(s1)) string1 = DEFAULT_STRING; if(!setString2(s2)) string2 = DEFAULT_STRING; if(!setString3(s3)) string3 = DEFAULT_STRING; } public boolean setString1(String s1) { if(validString(s1)) { this.string1 = s1; return true; } else return false; } public boolean setString2(String s2) { if(validString(s2)) { this.string2 = s2; return true; } else return false; } public boolean setString3(String s3) { if(validString(s3)) { this.string3 = s3; return true; } else return false; } public String getString1() { return string1; } public String getString2() { return string2; } public String getString3() { return string3; } public String toString() { return "[ string1: " + string1 + ", string2: " + string2 + ", string3: " +string3 + " ]"; } private static boolean validString(String s) { if(s != null && s.length() >= MIN_LEN && s.length() <= MAX_LEN) return true; else return false; } }