Question

java中现在有字符串123456789 我要截取最后3个字符 显示为123456 如何截取？ 123456 截最后3个字符显示123

Answer 1

String str = "123456789";
String subStr = str.substring(0, str.length() -3);

Answer 2

这个是可执行的源码，希望你能看得懂。
public static void main(String[] args) {
final String str = "12345789";
seperateString(str,3);
}

public static void seperateString(String str, int endLength) {
if (str == null || str.length() < endLength) {
System.out.println("string length should be more than "+endLength);
return;
}

final int seperateIndex = str.length() - endLength;
String firstStrPart = str.substring(0, seperateIndex);
String endStrPart = str.substring(seperateIndex);
System.out.println(firstStrPart + "," + endStrPart);
}

Answer 3

public class Test {

public static void main(String[] args) {
String num1 = "123456789";
String num2 = "123456";
System.out.println(num1.substring(0,6));
System.out.println(num2.substring(0,3));
}
}

Answer 4

Scanner scan=new Scanner(System.in);

String a=scan.nextLine();
System.out.println(a.substring(0, a.length()-3));

Answer 5

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