java String转int int转化为String

String转int

String str = "123";

int a = Integer.parseInt(str);
System.out.println(a);

Integer b = Integer.valueOf(str);
System.out.println(b);

int c = Integer.valueOf(str).intValue();
System.out.println(c);

int转化为String

int i = 123;

String s = String.valueOf(i);
System.out.println(s);

String s2 = i + "";
System.out.println(s2);

String s3 = Integer.toString(i);
System.out.println(s3);