面向对象在数组中实现添加，排序，显示

commodity[] a=new commodity[3];

          for (int i = 0; i < a.length; i++) {

              commodity b=new commodity();

               b.num=Integer.parseInt(JOptionPane.showInputDialog(null,

                        "请输入第"+(i+1)+"个商品编号"));

              b.comName=JOptionPane.showInputDialog(null,

                        "请输入第"+(i+1)+"个商品名字");

               b.jiage=Integer.parseInt(JOptionPane.showInputDialog(null,

                        "请输入第"+(i+1)+"个商品价格"));

              a[i]=b;

          }

          for (int i = 0; i < a.length; i++) {

              for (int j =i+1; j < a.length; j++) {

                   if(a[i].jiage<a[j].jiage){

                        commodity q=a[i];

                        a[i]=a[j];

                        a[j]=q;

                   }

              }

          }

          String c="编号  名字  价格\n";

          for (int i = 0; i < a.length; i++) {

              c+=a[i].num+" "+a[i].comName+" "+a[i].jiage+"\n";

          }

          JOptionPane.showMessageDialog(null, c);