java如何将String转换为Int

Integer x = Integer.valueOf(str);
 
// or
 
int y = Integer.parseInt(str);
 

int foo;
 
String StringThatCouldBeANumberOrNot = "26263Hello"; //will throw exception
 
String StringThatCouldBeANumberOrNot2 = "26263"; //will not throw exception
 
try {
 
      foo = Integer.parseInt(StringThatCouldBeANumberOrNot);
 
} catch (NumberFormatException e) {
 
 //Will Throw exception!
 
 //do something! anything to handle the exception.
 
}
 


 
try {
 
      foo = Integer.parseInt(StringThatCouldBeANumberOrNot2);
 
} catch (NumberFormatException e) {
 
 //No problem this time but still it is good practice to care about exceptions.
 
 //Never trust user input :)
 
 //do something! anything to handle the exception.
 
}