//in the above code we have reversed the string using a for loop in javapublicclass reverseofthestring {publicstaticvoidmain(String[] args){String s1 ="java is fun";// we are creating the second string to store the reversed string and print it while iterating the for loopString s2 ="";for(int i = s1.length()-1; i>=0; i--){// in the above line we have stored the reversed string by iterating the for loop from the last index and stored the value in the second string created s2.
s2 = s2 + s1.charAt(i);}System.out.print("The reversed string of the '"+s1+"' is: ");System.out.println(s2);}}
publicclass reverseusingbuilder {publicstaticvoidmain(String[] args){StringBuilder s1 =newStringBuilder("abc");System.out.println("The original string1 is = "+ s1);StringBuilder s2 =newStringBuilder("cab");System.out.println("The original string2 is = "+ s2);StringBuilder s3 =newStringBuilder("wer");System. out.println("The original string3 is = "+ s3);// reversing of stringbuilderSystem.out.println("The reverse of the string is reverse1 = "+ s1.reverse());System.out.println("The reverse of the string2 is reverse2 = "+ s2.reverse());System.out.println("The reverse of the string3 is reverse2 = "+ s3.reverse());}}
出力
The original string1 is = abc
The original string2 is =cab
The original string3 is =wer
The reversed string1 is = cba
The reversed string2 is = bac
The reversed string3 is =rew
publicclass reverse string
{//in this line we are writing the recursive function to reverse a stringpublicString reverse string(String s1){//first we will check if the string is empty or notif(s1.isEmpty()){System. out.println("String is empty.")//if the above condition is true then it returns the same string as if the string is empty itself then we cannot reverse the stringreturn s1;}else{returnreverseString(s1.substring(1))+s1.charAt(0);}}publicstaticvoidmain(String[] args){
reversestring q1 =newreversestring();String res1 = q1.reverseString("JAVA IS FUN");String res2 = q1.reverseString("STRINGS OBJECTS JAVA");String res3 = q1.reverseString("IMMUTABLE CLASS OBJECTS");System.out.println(res1);System.out.println(res2);System.out.println(res3);}}
出力
NUF SI AVAJ
AVAJ STCEJBO SGNIRTS
STCEJBO SSALC ELBATUMMI
publicstaticStringreverseusingrecursion(String s1){if(s1.length()==1){return s1;}//We have applied recursion in this linereturn s1.charAt(s1.length()-1)+reverseUsingRecursion(s1.substring(0, s1.length()-1));}
publicclassMain{// In this Method of conversion we have to reverse a string in Java using a character arraypublicstaticStringreverse(String s1){// we have to check if the string is empty or not and return if the string is null or emptyif(s1 ==null|| s1.equals("")){return s1;}// if it is equal to empty then we will simply print the string and break it.// else we will find the string lengthint len = str.length();// and then we have to create a character array of the same size as that of the string to store the value after reversingchar[] new_arr =newchar[n];// and by iterating the loop backward we have to fill the character array backward with characters in the stringfor(int i =0; i < len; i++){
new_arr[len - i -1]= str.charAt(i);}// and in the final step after reversing we have to convert the character array to string and return ittoreturnString.copy value of(new_arr);}publicstaticvoidmain(String[] args){// taking a string input for reverseString s1 ="JAVA IS FUN";// In this line we are calling the reverse function and reversing the string
str =reverse(str);System.out.println("The reversed string is "+ s1);}}
出力
NUF SI AVA
このメソッドでは、文字列を既知の文字配列に反転する必要があるため、まず文字列が空かどうかを確認し、文字列が null か空かどうかを返し、空に等しい場合は文字列を出力します。 Break そうでない場合は、文字列の長さを調べます。次に、文字列と同じサイズの文字配列を作成して、反転後の値を保存する必要があります。また、ループを逆方向に反復することで、文字配列を文字列内の文字で逆方向に埋める必要があります。そして、反転後の最後のステップでは、文字配列を文字列に変換して返す必要があります。よりわかりやすく明確な説明を得るには、エディターで上記のコードを実行してください。次のステップでは、Stream API を使用して Java で文字列を反転することもできます。それでは、いくつかの例を使用して、それらについて詳しく読んでみましょう。
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