Java11-6 other functions of the String class

Additional features of the String class:

Replacement function:
String replace (char Old,char new)
String Replace (string old,string new)

Remove string Two spaces
String Trim ()

Compare two strings in a dictionary order
int CompareTo (String str) Case-sensitive
int comparetoignorecase (String str) is case insensitive

1  Public classStringTest3 {2 3      Public Static voidMain (string[] args) {4String s = "HelloWorld";5         6         //character substitution: String replace (char Old,char new)7String S1 = s.replace (' o ', ' K ');8System.out.println (S1);//Hellkwkrld9         Ten         //string Substitution: String replace (string old,string new) OneString s2 = s.replace ("ll", "KK"); ASYSTEM.OUT.PRINTLN (S2);//Hekkoworld -          -          the         //Remove string Two spaces -String s4 = "Hello World"; -String S5 =S4.trim (); -System.out.println ("S4:" + S4 + "---");//the left and right spaces remain +System.out.println ("S5:" + S5 + "---");//the left and right spaces have been removed -  +          A         //compare two strings in dictionary order (ASCII table): at         //int compareTo (String str) -String A1 = "Cat"; -String A2 = "Dog"; -String a3 = "Cat"; -String a4 = "Door"; -String A5 = "Cat"; inString a6 = "C"; -          to         intI1 =A1.compareto (A2); + System.out.println (i1); -         //-1 c in front of B, ASCII code table, A1 c minus A2 B, equals-1 the          *System.out.println (A1.compareto (A3));// + $         //A1 C in ASCII value minus A2 C in ASCII value. GetPanax Notoginseng          -System.out.println (A2.compareto (A4));//-8 the         //A2 The first 2 letters do and A4 the first 2, a2 the third G minus A4 The third O, get-8 +          ASystem.out.println (A1.compareto (A5));//0 the         //A1 and A5 array elements are exactly the same +          -System.out.println (A1.compareto (A6));//2 $         //Ctrl + Left click Comperto View Source $     } -  - } the  -CompareTo source code, as well as "System.out.println (A1.compareto (A6));//2 "AnalysisWuyi  the  Private Final Charvalue[]; -    Wu the string is automatically converted to an array of characters.  -    About    $  Public intcompareTo (String anotherstring) { -         //this-a1-"Cat" -         //anotherstring-a2-"C" -          A         intLen1 =value.length; +         //this.value.length = A1.tochararray (). Length = = 3 the         -         intLen2 =anotherString.value.length; $         //anotherString.value.length = A2.tochararray (). length = = 1 the          the         intLim =math.min (Len1, len2); the         //Lim = Math.min = 3-1 = 2; lim = 2 the          -         CharV1[] =value; in         //char v1[] = {' C ', ' a ', ' t '}; the         the         CharV2[] =Anotherstring.value; About         //char v2[] = {' C '}; the          the         intK = 0; the          while(K <Lim) { +             CharC1 = V1[k];//c1 = ' C ', ' a ', ' t ' -             CharC2 = V2[k];//c2 = ' C ' the             if(C1! =C2) {Bayi                 returnC1-C2; the             } thek++;//when K=1, K!< lim, Lim = 1; so jump out of the loop -         } -         returnLen1-len2;//after jumping out of the loop, here, compare the lengths of two arrays 3-1 = 2 the     } the      theString A1 = "Cat"; theString a6 = "C"; -System.out.println (A1.compareto (A6));//2

Java11-6 other functions of the String class