来自 String.format（） 的非法转义字符

问：

编辑：

当我尝试编译我的 Java 程序时，我收到“错误：非法转义字符”。

最小可重复示例：

public static void main(String... args) {
    String output = String.format("%7d\%7d\%5d\t%%5s\t%s", 1299.97, 465.64, 1963, "00694", "ATLAS CENTAUR 2");
}

预期输出：

 1299.97      465.64    1963      00694        ATLAS CENTAUR 2         

javac 的输出：

Main.java:6: error: illegal escape character
        String output = String.format("%7d\%7d\%5d\t%%5s\t%s", 1299.97, 465.64, 1963, "00694", "ATLAS CENTAUR 2");
                                           ^
Main.java:6: error: illegal escape character
        String output = String.format("%7d\%7d\%5d\t%%5s\t%s", 1299.97, 465.64, 1963, "00694", "ATLAS CENTAUR 2");
                                               ^
2 errors

如何解决此问题？

原来问题，可以忽略：

第 44 行出错，我不知道如何解决

Hi I am new to java programming. I want to write a java program to print out the satilites from a website. Error at line 44 and I don't know how to fix it. I'm not sure if I'm using the .format right. Can I please have some help?

This is the assignment:

作业 3 是：

编写 3 个函数：

apogee which takes 2 parameters, mean motion and eccentricity and returns the apogee in kilometers.

perigee which takes 2 parameters, mean motion and eccentricity and returns the perigee in kilometers.

launch year yyyy which takes an integer parameter, the 2 digit launch year, and returns an integer, the 4 digit launch year.

    hint: use the date for the 1st ever artificial satellite launch to write a function that will work until 2057

不要忘记偏心率的“假定小数点”。（在将提取的子字符串转换为双精度之前，使用 String 连接将前导“0.”预置到提取的子字符串中）。

它应该看起来像这样：

 1299.97      465.64    1963      00694        ATLAS CENTAUR 2         
  813.27      765.76    1964      00733        THOR AGENA D R/B        
  753.32      648.28    1964      00877        SL-3 R/B                
  799.01      704.45    1967      02802        SL-8 R/B                
  616.16      574.02    1968      03230        SL-8 R/B                
  .....................................................