public class IntegerDemo2 {
public static void main(String[] args) {
  // 把int类型变成Integer类型
  int num = 100;
  Integer i = new Integer(num);
  System.out.println(i.toString());
  // 把String类型变成Integer类型
  String s = "100";
  // String s = "100abc";
  // NumberFormatException:数据格式化异常
  Integer ii = new Integer(s);
  System.out.println(ii);
}
}

public class IntegerDemo2 {
public static void main(String[] args) {
  // 把int类型变成Integer类型
  int num = 100;
  Integer i = new Integer(num);
  System.out.println(i.toString());
  // 把String类型变成Integer类型
  String s = "100";
  // String s = "100abc";
  // NumberFormatException:数据格式化异常
  Integer ii = new Integer(s);
  System.out.println(ii);
}
}