在主方法中创建String型变量，实现判断两个字符串是否相等，并将结果输出

public class Opnion {    public static void main(String args[]){        String a = "abc";        String b = "ABC";        String c = "abc";        boolean x = a.equals(b);                //比较大小写        boolean y = a.equalsIgnoreCase(b);      //忽略大小写        System.out.println(x);        System.out.println(y);    }}