how to extract numeric values from input string in java

Question

How can I extract only the numeric values from the input string?

For example, the input string may be like this:

String str=\"abc d 1234567890pqr 548         


        

Answer 1

Just extract the digits

String str=" abc d 1234567890pqr 54897";        

for(int i=0; i 47 && str.charAt(i) < 58)
        System.out.print(str.charAt(i));

Another version

String str=" abc d 1234567890pqr 54897";        
boolean flag = false;
for(int i=0; i 47 && str.charAt(i) < 58) {
        System.out.print(str.charAt(i));
        flag = true;
    } else {
        System.out.print( flag ? '\n' : "");
        flag = false;
    }