1 public class VarDemo

  2 {

  3     public static void main(String []args){

  4      //先声明后赋值

  5      int number;

  6      number = 1;

  7      System.out.println(number);

  8      //声明的同时赋值

  9      int data = 2;

 10      System.out.println(data);

 11      //同时声明多个变量

 12      /*错误写法1：

 13      int data2,data3,data4 = 100;

 14      System.out.println(data2);

 15      System.out.println(data4);

 16      */

 17      /*错误写法2：

 18      int data2=data3=data4 = 100;

 19      System.out.println(data2);

 20      System.out.println(data4);

 21      */

 22      //可以的写法：

 23      int data2=10,data3=20,data4 = 100;

 24      System.out.println(data2);

 25      System.out.println(data4);

 26     }

 27