jumain.java

针对越来越多的用户喜欢JAVA

class JuSum
{
  float a[ ][ ]={{1,2,3},{4,5,6},{7,8,9}};
  float sum=0;
  float getSum()
  {
    System.out.println("矩阵元素：");
    for(int i=0;i<a.length;i++)
    {
      for(int j=0;j<a[0].length;j++)
        System.out.print(a[i][j]+"\t");
      System.out.print("\n");
    }
    for(int i=0;i<a.length;i++)
      sum=sum+a[i][i];
    return sum;
 }
}
public class JuMain
{
  public static void main(String[ ] args)
  {
    JuSum m=new JuSum();
    System.out.println("对角线元素之和："+m.getSum());
  }
}