int a[][] = new int[9][];
for(int i=0;i<9;i++){
    a[i]=new int[i+1];
    for(int j=0;j<a[i].length;j++){
        a[i][j] = (i+1)*(j+1);
    System.out.print(a[i][j]+"\t");
    }
    System.out.println();
}

------解决方案--------------------
给个例子给你参考一下：
Java code

public class MultiplicationTable {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        for (int i = 1; i < 10; i++) {
            for (int j = 1; j <= i; j++) {
                int multiplication = i * j;
                System.out.print(j + "*" + i + "=" + multiplication + "\t");
            }
            System.out.println();
        }
    }
}

------解决方案--------------------
Java code

public class list
{  
    public static void main(String args[])
    {  
        //int a[][]=new int [100][100];
        int sum = 0;
        for(int i=1;i <=9;i++)
        {
            for(int j=1;j <=i;j++)
            {
                                //a[i][j]=i*j;
                                //System.out.print("\t\t"+a[i][j]);
                sum=i*j;
                System.out.print(sum+"  ");
            }
            System.out.println();
        }
    }  
}

------解决方案--------------------
7楼的可以，其实就是两个for循环，搂主加油俄！