二维数组的打印，查找等

二维数组的打印

public class TwoDimensionalArray {

    public static void main(String[] args) {
        int x = 0;
        int[][] a = { { 8, 2, 6, 5 }, { 6, 3, 1, 0 }, { 8, 7, 9, 6 } };
        System.out.print("\t \t");
        for (int i = 0; i <= a.length; i++) {
            System.out.print(i + "\t");
        }
        System.out.print("\n\t" + "-------------------------");
        System.out.println();
        for (int i = 0; i < a.length; i++) {
            System.out.print(i + "  |\t");

            for (int j = 0; j < a[i].length; j++) {
                System.out.print(a[i][j] + "\t"); // "\t"是制表符
            }
            System.out.println();
        }

    }
}

　

 

　

public class TwoDimensionalArray {

    public static void main(String[] args) {
        int[][] a = {{8, 2, 6, 5}, {6, 3, 1, 0}, {8, 7, 9, 6}};
        for (int i=0;i<3;i++)
            System.out.println ( Arrays.toString (a[i]));

    }
}

 

　　

 

二维数组的查找

public class Array {

        public static boolean find(int [][] arry,int num){
            int column=arry[0].length-1;
            int row=0;
            while(row<arry.length&&column>=0){
                if(num==arry[row][column]){
                    return true;
                }
                if(arry[row][column]>num){
                    column--;
                }else{
                    row++;
                }

            }
            return false;
        }

        public static void main(String[] args) {
            int [][] arry=new int[3][3];
            for(int i=0;i<arry.length;i++){
                for(int j=0;j<arry[0].length;j++){
                    arry[i][j]=(i+1)*(j+1);
                }
            }

            System.out.println("查看是否有元素9:"+find(arry,9));
            System.out.println("查看是否有元素10:"+find(arry,10));
        }

    }

　

public class TwoDimensionalArray {

    int[][] a = {{8, 2, 6, 5}, {6, 3, 1, 0}, {8, 7, 9, 6}};

    public static boolean find(int[][] arry, int num) {
        int column = arry[0].length - 1;
        int row = 0;
        while (row < arry.length && column >= 0) {
            if (num == arry[row][column]) {
                return true;
            }
            if (arry[row][column] > num) {
                column--;
            } else {
                row++;
            }

        }
        return false;
    }

    public static void print(int[][] a) {
        int x = 0;

        System.out.print("\t \t");
        for (int i = 0; i <= a.length; i++) {
            System.out.print(i + "\t");
        }
        System.out.print("\n\t" + "-------------------------");
        System.out.println();
        for (int i = 0; i < a.length; i++) {
            System.out.print(i + "  |\t");

            for (int j = 0; j < a[i].length; j++) {
                System.out.print(a[i][j] + "\t"); // "\t"是制表符
            }
            System.out.println();
        }
    }

    public static void main(String[] args) {
        int[][] arry = new int[3][3];
        for (int i = 0; i < arry.length; i++) {
            for (int j = 0; j < arry[0].length; j++) {
                arry[i][j] = (i + 1) * (j + 1);
            }
        }
        print(arry);
        System.out.println();
        System.out.println("查看是否有元素9:" + find(arry, 9));
        System.out.println("查看是否有元素10:" + find(arry, 10));
    }
}

　　

　偶数

public class OddTest {

        public static void main(String[] args) {
            boolean odd = true;// 奇数行标志
            for (int i = 2; i <= 50; i += 2) {
                System.out.print(odd ? i + "\tA\t" : "A\t" + i + "\t");
                if (i % 10 == 0) {
                    System.out.println();
                    odd = !odd;
                }
            }
        }
}