Java 将一个字符串分成两半
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Splitting a string into two halfs
提问by
I am making a new conversion software to hide messages (for fun). I have made a Binary and Decimal conversion class and my idea is, a user inputs string, it converts all to Binary format. Then splits it in half, converts one half to decimal, then adds the string back together again to make it a mix of binary and decimal. In other versions I will add more conversions, more splits,and maybe convert to languages too. I need splitting the string in half. This is my code so far::
我正在制作一个新的转换软件来隐藏消息（为了好玩）。我做了一个二进制和十进制转换类，我的想法是，用户输入字符串，它将所有转换为二进制格式。然后将其分成两半，将一半转换为十进制，然后再次将字符串相加，使其成为二进制和十进制的混合。在其他版本中，我将添加更多转换、更多拆分，并且也可能转换为语言。我需要将字符串分成两半。到目前为止，这是我的代码::
public ray() {
Scanner in = new Scanner(System.in);
while (true) {
System.out.println("Please input the text you wish to encode!");
System.out.println("Type '#' to quit the Software.");
String s1 = in.nextLine();
if ("#".equalsIgnoreCase(s1)) {
System.out.println("Goodbye, hope you enjoyed RAYConversion v1.0 Alpha.");
// close software
}
// convert all to binary
binary Binary = new binary();
//what i need to do is split stirng s1 in half, make it into different strings. Then I will convert
//the two strings to binary and decimal. I made a converter for that.
}
}
采纳答案by karim mohsen
final int mid = s1.length() / 2; //get the middle of the String
String[] parts = {s1.substring(0, mid),s1.substring(mid)};
System.out.println(parts[0]); //first part
System.out.println(parts[1]); //second part
回答by burglarhobbit
I guess this will get you done what you want to achieve:
我想这会让你完成你想要实现的目标：
P.S. Note that for Strings with oddnumber of characters, the second-half String will get the benefit of the extra character.
PS请注意，对于具有odd字符数的字符串，后半字符串将获得额外字符的好处。
Create a method like this:
创建一个这样的方法：
public static String substring(int a, int b, String temp) {
String a = "";
for(int i = a; i<b; i++) {
char ch1 = temp.charAt(i);
a = a + ch1;
}
return a;
}
and in your mainfunction, call the method as below:
并在您的main函数中，调用如下方法：
String s1a = substring(0, (s1.length()/2), s1);
String s1b = substring((s1.length()/2),s1.length(), s1);
回答by Paras Diwan
You can use Java's substring function to divide them in halves:
您可以使用 Java 的 substring 函数将它们分成两半：
String s1a = s1.substring(0, (s1.length()/2));
String s1b = s1.substring((s1.length()/2);
回答by bcsb1001
Try this:
尝试这个：
int len = whole.length();
String a = whole.substring(0, len / 2), b = whole.substring(len / 2);
This uses the substring()method. In the case of a Stringwith odd length, the second half will be one character longer.
这是使用substring()方法。在String长度为奇数的情况下，后半部分将长一个字符。
