如何将字符串转换为数组

这是一个Java应用程序，它可以实现以下功能：

1. 判断两个字符串是否相同
2. 判断字符串的前缀、后缀是否和某个字符串相同
3. 按字典顺序比较两个字符串的大小关系
4. 检索字符串
5. 创建字符串
6. 将数字型字符串转换为数字
7. 将字符串存放到数组中
8. 用字符数组创建字符串

下面是代码示例：

import java.util.Arrays;

public class StringOperations {
    public static void main(String[] args) {
        String str1 = "hello";
        String str2 = "world";
        String str3 = "hello world";
        String str4 = "hello";
        String str5 = "world";
        String str6 = "java programming";
        String str7 = "programming";
        String str8 = "12345";
        String str9 = "67890";
        String[] strArray = {"apple", "banana", "cherry", "date", "elderberry"};

        // 判断两个字符串是否相同
        if (str1.equals(str4)) {
            System.out.println("str1 and str4 are equal");
        } else {
            System.out.println("str1 and str4 are not equal");
        }

        // 判断字符串的前缀、后缀是否和某个字符串相同
        if (str3.startsWith(str1)) {
            System.out.println("str3 starts with str1");
        } else {
            System.out.println("str3 does not start with str1");
        }

        if (str3.endsWith(str2)) {
            System.out.println("str3 ends with str2");
        } else {
            System.out.println("str3 does not end with str2");
        }

        // 按字典顺序比较两个字符串的大小关系
        int result = str1.compareTo(str2);
        if (result < ) {
            System.out.println("str1 is less than str2");
        } else if (result > ) {
            System.out.println("str1 is greater than str2");
        } else {
            System.out.println("str1 is equal to str2");
        }

        // 检索字符串
        int index = str6.indexOf(str7);
        if (index != -1) {
            System.out.println("str7 found at index " + index);
        } else {
            System.out.println("str7 not found");
        }

        // 创建字符串
        String str10 = new String("hello");
        System.out.println("str10: " + str10);

        // 将数字型字符串转换为数字
        int num1 = Integer.parseInt(str8);
        int num2 = Integer.parseInt(str9);
        System.out.println("num1 + num2 = " + (num1 + num2));

        // 将字符串存放到数组中
        String[] strArray2 = new String[5];
        strArray2[] = "apple";
        strArray2[1] = "banana";
        strArray2[2] = "cherry";
        strArray2[3] = "date";
        strArray2[4] = "elderberry";
        System.out.println(Arrays.toString(strArray2));

        // 用字符数组创建字符串
        char[] charArray = {'h', 'e', 'l', 'l', 'o'};
        String str11 = new String(charArray);
        System.out.println("str11: " + str11);
    }
}