枚举和封装类
package com.dasenlin.meiju;
public enum Gender {
Male,Famele;
}
package com.dasenlin.meiju;
import java.math.BigDecimal;
package com.dasenlin.meiju;
import java.math.BigDecimal;
public class Test {
public static void main(String[] args) {
Gender sex =Gender.Male;
System.out.println(sex);
System.out.println(Integer.toBinaryString(20));
System.out.println(Integer.toHexString(10));
System.out.println(Integer.toOctalString(20));
Float f = new Float(3.14);
Float f1 = new Float("3.14");
Boolean bool = new Boolean("true1");
System.out.println(bool);
Number number = new BigDecimal("123.45");
System.out.println(number);
String ss=bool+"";
bool.toString();//bool有可能为空
String ss2=null;
if("123".equals(ss2)){
System.out.println("are");
}
}
}