在 java 字符串中的两个字符之间添加点

Question

I have a string:

String x = "10";

Now I want to add . between the numbers and print it like this

1.0

How can I achieve this?

Answer 1

You can split the string into the first character and the rest of the string, and then insert a dot '.' in between, like this:

String res = x.substring(0,1)+"."+x.substring(1);
//           ^^^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^
//            the first digit     the rest of the string

You can also use replaceAll to do it on longer strings, like this:

String orig = "19,28,37,46";
System.out.println(orig.replaceAll("(\\d)(\\d)", "$1.$2"));

This prints

1.9,2.8,3.7,4.6

Answer 2

使用DecimalFormat类可以更好地解耦值及其表示。

Answer 3

如果字符串始终是 2 位数字：

String result = x.charAt(0) + "." + x.charAt(1);

Answer 4

this function can accepts all number and returns a dotted string, with small touches it can accepts many in other types of data an return data with options

    fun getStringWithDot(nums: Int): String {
var str = ""
val istr = nums.toString()
for (ch in istr.indices){
    if (ch == istr.length-1){
        str += istr.substring(0,1)
    }else{
        str += istr.substring(ch,ch+1) + "."
    }

}
return str

}

Answer 5

public static void main(String args[])

{
Scanner S=new Scanner(System.in);

int arr[];

int number;

number=S.nextInt();

int length=Integer.toString(number).length();

arr=new int[length];

char arr2[];

arr2=new char[length];

int count=0;

char arr3[];

arr3=new char[length];

String Q=Integer.toString(number);

for(int i=0;i<arr3.length;i++)

{

    System.out.print(Q.charAt(i)+".");

}

}