Java：将扫描仪输入作为字符串类型使用 Do-while 循环：制作一个计算简单数学的程序，如果您输入“是”则让它重复

Question

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I am a little confused how to implement nextLine() in my code. I am looking at my teachers code and I wanted to use a string instead of a char? Is there a way I can do that?

Answer 1

Some of the lines in the code you linked to do not compile.

For example, myObj.nextLine(); returns a String, and in java, String and char is not interchangible; the line isRepeat = someStringExpr; does not compile.

Separately, don't mix nextLine and nextAnythingElse , it doesn't work the way you intend. If you want to read entire lines, use .useDelimiter("\r?\n"); to change the scanner from 'read things separated by spaces' to 'read things separated by newlines'. Then, you can just use next() to get an entire line, as a string.

Once you've 'fixed' isRepeat to be a String , note that in java, strings are delimited by double quotes, so it's "Yes" , not 'Yes', and finally, you use .equals() to compare strings, not == which won't work: while (isRepeat.equals("Yes")); is what you're looking for.

Note that in the original code, .next() is used (not nextLine - you don't want nextLine).