String 与primitive主数据类型的转换

public class MyString//将primitive主数据类型换为String{public static void main(String [] args){double d=42.5;String doubleString=""+d;System.out.println(doubleString);String doubleString2=Double.toString(d);System.out.println(doubleString2);}}public class Transport//将String换为主数据类型{public static void main(String [] args){String s="2";int x=Integer.parseInt(s);double d=Double.parseDouble("420.4");boolean b=new Boolean("true").booleanValue();System.out.print(x+" "+d+" "+b);String t="two";int y=Integer.parseInt(t);}}