如何打印變量的值中的java

Question

System.out.printf("The Sum is %d%n" , sum); 

和誤差是 的方法的printf在類型爲PrintStream（字符串，對象[]）是不適用的參數（字符串，整數）

System.out.printf("The sum is " + sum); 

運作，但如果我需要打印

"The Sum of 5 and 6 is 11"

System.out.printf("The sum of %d and %d is %d . " ,a,b,sum); 

，但得到的Eclipse平臺版本上述錯誤：3.8.1（Ubuntu的）

Answer 1

如果System.out.printf是給你這個錯誤簡單的方法：

The method printf(String, Object[]) in the type PrintStream is not applicable for the arguments (String, int) 

然後您必須配置爲正確的Java版本的項目。

可變參數的方法與Java 5

或者進行了介紹，你可以這樣做：

System.out.printf("The Sum of %d and %d is %d\n", new Object[] {a, b, sum}); 

Answer 2

有看看這個問題，你的錯誤：Eclipse Java printf issue PrintStream is not applicable

或者您可以使用.format或.println

System.out.format("The sum of %d and %d is %d . " ,1, 2, 3); 
System.out.println("The sum of %d and %d is %d . " ,1, 2, 3); 

https://docs.oracle.com/javase/tutorial/java/data/numberformat.html

有了適當的Java版本設置.printf也將按預期

System.out.printf("The sum of %d and %d is %d . " ,1, 2, 3); 

Answer 3

int a = 2; 
int b = 4; 
int c = a + b; 
System.out.format("The sum of %d and %d is %d ", a, b, c); 

這是格式化輸出