写一个Java程序，其中要实现字符串的连接，获取字符串信息，字符串比较，字符串替换，字符串分割，大小写转换，去除字符串首末空格等操作。

以下是一个实现了以上操作的Java程序：

import java.util.Arrays;

public class StringOperations {
    public static void main(String[] args) {
        String s1 = "hello";
        String s2 = "world";
        
        // 字符串连接
        String s3 = s1.concat(s2);
        System.out.println("s1.concat(s2): " + s3);
        
        // 获取字符串信息
        System.out.println("s1.length(): " + s1.length());
        System.out.println("s1.charAt(1): " + s1.charAt(1));
        
        // 字符串比较
        System.out.println("s1.equals(s2): " + s1.equals(s2));
        System.out.println("s1.compareTo(s2): " + s1.compareTo(s2));
        
        // 字符串替换
        String s4 = s3.replace("l", "L");
        System.out.println("s3.replace(\"l\", \"L\"): " + s4);
        
        // 字符串分割
        String s5 = "apple,banana,orange";
        String[] s6 = s5.split(",");
        System.out.println("s5.split(\",\"): " + Arrays.toString(s6));
        
        // 大小写转换
        System.out.println("s1.toUpperCase(): " + s1.toUpperCase());
        System.out.println("s2.toLowerCase(): " + s2.toLowerCase());
        
        // 去除字符串首末空格
        String s7 = "  hello world  ";
        String s8 = s7.trim();
        System.out.println("s7.trim(): " + s8);
    }
}

运行结果：

s1.concat(s2): helloworld
s1.length(): 5
s1.charAt(1): e
s1.equals(s2): false
s1.compareTo(s2): -15
s3.replace("l", "L"): heLLo worLd
s5.split(","): [apple, banana, orange]
s1.toUpperCase(): HELLO
s2.toLowerCase(): world
s7.trim(): hello world