String replaceAll方法（Java）

Question

I have following problem,

Code:

String a="Yeahh, I have no a idea what's happening now!";
System.out.println(a);
a=a.replaceAll("a", "");
System.out.println(a);

Before removing 'a', result:

Yeahh, I have no a idea what's happening now!

Actual Result: After removing 'a', result:

Yehh, I hve no ide wht's hppening now!

Desired Result:

Yeahh, I have no idea what's happening now!

Anyone can give me some advices to achieve my desired result?

Answer 1

a = a.replace(" a ", " ");

You don't need the replaceAll(..) method - it is if you want to use regex, and you don't need it, at least for this example.

If you need this for more complex examples than shown, then use replaceAll(..) and take a look at java.util.regex.Pattern . For example, matching all whitespace characters is done using \\s

Answer 2

你应该确定要删除的特定“a”试试这个a.replace(" a ", " ");

Answer 3

You were asking to replace every 'a', and that is what you got.

Some solutions:

• replaceAll(" a ", " ") (note the spaces around the 'a')
• use regex to chek for 'a' surrounded by word barriers (\\b if I'm not mistaken)

Answer 4

Try using this:

String str = "Yeahh, I have no a idea what's happening now!";

String newStr = str.replaceAll(" a ", " ");

Answer 5

a.replace("Yeahh", "Yehh");

Is it just replacing the a in Yeah? or the first a in the string?