자바 배열 문제 Reverse 역순으로 출력하는 과정

package jong.reverse;

import java.util.Random;

import java.util.Scanner;

public class Reverse {

Scanner sc = new Scanner(System.in);

Random r = new Random();

public void reversetotal() {

while(true) {

System.out.println("배열의 역순 문제");

System.out.println("1. char형으로 들어왔을때 하는법");

System.out.println("2. char형으로 입력을 받아서 하는법");

System.out.println("0. 종료");

System.out.print("입력");

int sel = sc.nextInt();

switch(sel) {

case 1 : reverse(); break;

case 2 : reverse2(); break;

case 0 : return;

}

}

}

public void reverse() {

char [] a = {'J','o','n','g','k','y','u'};

System.out.println("3개출력");

for(int i=0; i<a.length; i++) {

System.out.print(a[i]);

}

System.out.println("\n3줄 출력줄마다 같게");

for(int i=0; i<a.length;i++) {

for(int j=0; j<a.length; j++) {

System.out.print(a[i]);

}

System.out.print("\n");

}

System.out.println("줄마다 다르게");

for(int i=0; i<a.length;i++) {

for(int j=0; j<a.length; j++) {

System.out.print(a[j]);

}

System.out.print("\n");

}

System.out.println("잠깐 생각해보기");

for(int i=1;i<=5;i++) {

for(int j=1;j<=5;j++) {

System.out.print(i+j-1);

}

System.out.println();

}

int count=0;

char a1;

System.out.println("실습문제들어가자");

System.out.println(a.length);

while(true) {

for(int i=0; i<a.length; i++) {

System.out.print(a[i]);

}

a1 = a[0];

for(int i=1; i<a.length; i++){

a[i-1]=a[i];

}

a[6]=a1;

count++;

System.out.print("\n");

if(count==8)

break;

}

}

public void reverse2() {

char a1;

int count=0;

while(true) {

System.out.print("알파벳 몇글자로 하시겠습니까?");

int num = sc.nextInt();

char [] a = new char[num];

for(int i=0; i<num; i++) {

System.out.print(i+"번째 들어갈 문자");

a[i] = sc.next().charAt(0);

}

while(true) {

for(int i=0; i<a.length; i++) {

System.out.print(a[i]);

}

a1 = a[0];

for(int i=1; i<a.length; i++){

a[i-1]=a[i];

}

a[(num-1)]=a1;

count++;

System.out.print("\n");

if(count==num+1)

break;

}

break;

}

}

}

//종규의 역순출력과정