public class HelloWorld {

    public static void main(String[] args) {

// 定义一个长度为5的字符串数组，保存考试科目信息

String[] subjects =new String[] {"oracle","php","linux","java","html"};

// 分别为数组中的元素赋值

/* subjects[0] = "Oracle";

subjects[1] = "PHP";

subjects[2] = "Linux";

subjects[3] = "Java";

subjects[4] = "HTML";*/

System.out.println("数组中第4个科目为：" + subjects[3] );

}

}

你的数组是String类型，你给数组初始化，每一项都需要双引号，我上面这段代码你运行一下就没问题了 。