Import java.util.scanner;
Common class test {
Public static void main(String[] args) {
Scanner input = new scanner (system. in);
System.out.println ("Please enter an integer:");
int length = input . nextint()； //Enter an integer.
System.out.println ("The integer entered is:"+length); }
}
Note: The Scanner function is used for statement input. The above example is an integer type, or you can use the following statement "String length=input.next ()", and the input is a string type.
Method for judging whether it is an integer:
Method one
Package operation;
Import java.io.bufferedreader;
Import java.io.ioexception;
Import java.io.inputstreamreader;
Public class Test2 {
Public static void main(String[] args) {
BufferedReader bReader = null
bReader = new buffered reader(new InputStreamReader(system . in))；
Try {
String line = null
int sum = 0；
for(int I = 0； I<2; i++) {
System.out.println ("Please enter the first one" +(i+ 1)+ "integer");
//Get the data input by the keyboard
line = breader . readline()；
//Judge whether it is a number.
if(line . matches("[0-9]+"){
//Converts a numeric string to an integer type.
sum+= integer . parse int(line)；
} Otherwise {
I-；
Continue;
}
}
system . out . println(sum)；
} catch (IOException e) {
// TODO automatically generated catch block
e . printstacktrace()；
}
}
}
//Method 2
Package operation;
Import java.io.bufferedreader;
Import java.io.ioexception;
Import java.io.inputstreamreader;
Public class Test3 {
Public static void main(String[] args) {
int sum = 0；
int count = 0；
String line = null
BufferedReader bReader = null
Do {
System.out.println ("Please enter the first one"+(count+1));
//Create a buffered character input stream and input data from the keyboard.
bReader = new buffered reader(new InputStreamReader(system . in))；
Try {
//Get data
line = breader . readline()；
//Determine whether it is an integer.
if(line . matches("[0-9]+"){
sum+= integer . parse int(line)；
count++；
}
} catch (IOException e) {
// TODO automatically generated catch block
e . printstacktrace()；
}
//Judge whether the data quantity meets the demand.
} while(count & lt； 2);
System.out.println ("the sum of two integers is"+sum ");
Try {
If (the baker! = null) {
breader . close()；
}
} catch (IOException e) {
e . printstacktrace()；
}
}
}