我在弄清楚如何对数组进行排序以及为数组添加另一个名称时遇到了一些麻烦。我在编写java方面相对较新，我似乎无法弄明白。 （麻烦在于选择4和enterTVshow（）） 有关如何处理此问题的任何建议？ 感谢
import java.io.*;
import java.util.Arrays;
public class JavaVision {
static BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
static int x;
static String name[] = new String[48];
public static void main(String[] args) throws IOException {
int choice;
do {
System.out.println(" ");
System.out.println("Java TV Program Menu");
System.out.println("----------------------------");
System.out.println("What would you like to do?");
System.out.println("1. Add a TV Show");
System.out.println("2. Modify a TV Show");
System.out.println("3. Delete a TV Show");
System.out.println("4. Sort TV Shows");
System.out.println("5. Show All TV Shows");
System.out.println("6. Exit");
choice = Integer.valueOf(in.readLine()).intValue();
if(choice ==1) {
enterTVshow();
}
if(choice ==2) {
modTVshow();
}
if(choice ==3) {
deleteTVshow();
}
if (choice ==4) {
Arrays.sort(name);
for (int i = 0; i < name.length; i++) {
}
}
if(choice ==5) {
System.out.println(Arrays.toString(name));
}
}while (choice !=6);
}
private static void deleteTVshow() throws IOException {
String deleteTVshow;
int flag = 0;
int i;
boolean found = false;
System.out.print("Which TV Show do you want to delete?");
deleteTVshow = in.readLine();
for(i = 0; i<=(x-1); i++) {
if(deleteTVshow.compareTo(name[i]) == 0) {
flag = x;
found = true;
}
}
if (found == false) {
System.out.println("There is no TV Show by that name.");
}
else {
for(i = flag; i <=(x-2); x++) {
name[i] = name[i+1];
}
x = x -1;
System.out.print("Type 'go back' to go back to the menu");
}while ((in.readLine().compareTo("go back")) !=0);
}
private static void modTVshow() throws IOException {
String modTVshow;
int flag = 0;
int i;
boolean found = false;
System.out.print("What is the TV Show you wish to modify?");
modTVshow = in.readLine();
for(i = 0; i<= (x-1); i++) {
if(modTVshow.compareTo(name[i]) == 0) {
flag = i;
found = true;
}
}
if (found == false) {
System.out.print("There is no TV show by that name.");
}
else {
System.out.print("Enter new Name: ");
name[flag] = in.readLine();
System.out.print("Type 'go back' to go back to the menu");
}while ((in.readLine().compareTo("go back")) !=0);
}
private static void enterTVshow() throws IOException {
x = 0;
do {
System.out.print("Enter TV Show Name:");
name[x] = in.readLine();
x++;
System.out.print("Adding Show.....");
System.out.println(" ");
System.out.print("Type 'go back' to go back to the menu ");
}while((in.readLine().compareTo("go back")) !=0);
}
}
答案 0 :(得分：0)
您在排序时遇到问题，因为您可能在数组的48个元素中的任何一个中都有一些空值。处理这个只是让你自己的比较器排序如下，或避免数组中的空值。
public class JavaVision {
static BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
static int x;
static String name[] = new String[48];
public static void main(String[] args) throws IOException {
int choice;
do {
System.out.println(" ");
System.out.println("Java TV Program Menu");
System.out.println("----------------------------");
System.out.println("What would you like to do?");
System.out.println("1. Add a TV Show");
System.out.println("2. Modify a TV Show");
System.out.println("3. Delete a TV Show");
System.out.println("4. Sort TV Shows");
System.out.println("5. Show All TV Shows");
System.out.println("6. Exit");
choice = Integer.valueOf(in.readLine()).intValue();
if(choice ==1) {
enterTVshow();
}
if(choice ==2) {
modTVshow();
}
if(choice ==3) {
deleteTVshow();
}
if (choice ==4) {
sortArray(name);
}
if(choice ==5) {
System.out.println(Arrays.toString(name));
}
}while (choice !=6);
}
private static void deleteTVshow() throws IOException {
String deleteTVshow;
int flag = 0;
int i;
boolean found = false;
System.out.print("Which TV Show do you want to delete?");
deleteTVshow = in.readLine();
for(i = 0; i<=(x-1); i++) {
if(deleteTVshow.compareTo(name[i]) == 0) {
flag = x;
found = true;
}
}
if (found == false) {
System.out.println("There is no TV Show by that name.");
}
else {
for(i = flag; i <=(x-2); x++) {
name[i] = name[i+1];
}
x = x -1;
System.out.print("Type 'go back' to go back to the menu");
}while ((in.readLine().compareTo("go back")) !=0);
}
private static void modTVshow() throws IOException {
String modTVshow;
int flag = 0;
int i;
boolean found = false;
System.out.print("What is the TV Show you wish to modify?");
modTVshow = in.readLine();
for(i = 0; i<= (x-1); i++) {
if(modTVshow.compareTo(name[i]) == 0) {
flag = i;
found = true;
}
}
if (found == false) {
System.out.print("There is no TV show by that name.");
}
else {
System.out.print("Enter new Name: ");
name[flag] = in.readLine();
System.out.print("Type 'go back' to go back to the menu");
}while ((in.readLine().compareTo("go back")) !=0);
}
private static void enterTVshow() throws IOException {
System.out.println();
x = 0;
while(name[x]!=null){
x++;
}
do {
System.out.print("Enter TV Show Name:");
name[x] = in.readLine();
x++;
System.out.print("Adding Show.....");
System.out.println(" ");
System.out.print("Type 'go back' to go back to the menu ");
sortArray(name);
}while((in.readLine().compareTo("go back")) !=0);
}
public static void sortArray(String [] myArray){
Arrays.sort(myArray, new Comparator<String>() {
@Override
public int compare(String o1, String o2) {
if (o1 == null && o2 == null) {
return 0;
}
if (o1 == null) {
return 1;
}
if (o2 == null) {
return -1;
}
return o1.compareTo(o2);
}});
}
}
答案 1 :(得分：0)
删除代码并不能说服我两个
for(i = 0; i<=(x-1); i++) {
if(deleteTVshow.compareTo(name[i]) == 0) {
flag = x; //should not change by flag=i; ?
found = true; // add break; ?
}
}
用于重新排列元素
for(i = flag; i <=(x-2); x++) { //increases why x? should not be i ++? i<=x condition?
name[i] = name[i+1];
}
不要忘记，一旦发现数组中的元素切断循环以避免延迟//中断;