1、右擊專案的包new--->Class,如圖所示：

3、在Demo類中編寫運算子程式碼，

int a = 10;

int b = 20;

int c = 25;

int d = 25;

System.out.println("a + b = " + (a + b) );

System.out.println("a - b = " + (a - b) );

System.out.println("a * b = " + (a * b) );

System.out.println("b / a = " + (b / a) );

System.out.println("b % a = " + (b % a) );

System.out.println("c % a = " + (c % a) );

System.out.println("a++ = " + (a++) );

System.out.println("a-- = " + (a--) );

//檢視 d++與++d的不同

System.out.println("d++ = " + (d++) );

System.out.println("++d = " + (++d) );

5、可以在控制檯檢視輸出，如圖所示：

注意檢視＋+d和d++的區別。