数据类型转换

package com.sxt;

/**
* 包装类
*
* @author Administrator
*
*/
public class BigDemo {
public static void main(String[] args) {
// int 类型的包装类的定义
Integer i = new Integer(1);
Integer j = new Integer(“100”);
Integer k = 1;
String s = “222”;
// 将String类型转换成int
int is = Integer.parseInt(s);
// String –> Integer
Integer iis = Integer.valueOf(s);
Float f = new Float(12.5f);
// int –> String String –> int double–>String String –>double
// int –>long long –> int String –>long String <–> boolean
String ts = “false”;
Boolean tsb = Boolean.valueOf(ts);
System.out.println(tsb);
// 包装类–>基本数据类
int ii = i.intValue();
Integer a = 1;// 装箱
int b = a;// 拆箱
// 自动装箱和自动拆箱
int c = 1;
String cs = c + “”;
String valueOf = String.valueOf(c);
Integer d = 1;
String string = d.toString();

}

}