Java程序代码记录一

package file;

public class J2 {
    public static void main(String[]args){
        Boolean b = new Boolean("true");
        boolean ret = b.booleanValue();
        System.out.print(ret);
    }

}

package file;

public class J2 {
    public static void main(String[]args){
        
        String s = "123";
        int a = Integer.parseInt(s);
        if(a == 123){
            System.out.println("now s==123");
            System.out.println(Long.MAX_VALUE);
            System.out.println(Long.MIN_VALUE);
            System.out.println(Double.MAX_VALUE);
            
            Integer a1 = 5;//自动解包
            int a2 = new Integer(5);//自动解包
            
            Boolean f = new Boolean("true");
            boolean d = f.booleanValue();
            
        }
    }

}