如何在java中检查二维数组中是否存在一对值

public class Main {
    public static void main(String[] args) {
        int[][] matrix = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};
        int target = 8;
        
        boolean isPairExist = checkPair(matrix, target);
        
        if (isPairExist) {
            System.out.println("存在一对值等于" + target);
        } else {
            System.out.println("不存在一对值等于" + target);
        }
    }
    
    public static boolean checkPair(int[][] matrix, int target) {
        // 遍历二维数组
        for (int i = 0; i < matrix.length; i++) {
            for (int j = 0; j < matrix[i].length; j++) {
                // 判断当前元素和后面的元素是否存在一对值等于目标值
                for (int k = j + 1; k < matrix[i].length; k++) {
                    if (matrix[i][j] + matrix[i][k] == target) {
                        return true;
                    }
                }
            }
        }
        
        return false;
    }
}