[Java認證題庫]_1Z0-803題庫詳解_10

[Java認證題庫]_1Z0-803題庫詳解_10

class CCircle{

double radius;

void setRadius(double radius) {

radius=radius;

// String radius="我是區域變數";

System.out.println("radius="+radius);

System.out.println("this.radius="+this.radius);

}

public String toString() {

String msg="物件的內容:radius="+radius;

return msg;

}

}

public class A7 {

public static void main(String[] args) {

CCircle c1=new CCircle();

CCircle c2=new CCircle();

c1.setRadius(2.0);

String s1=new String("Hello Java!");

System.out.println("s1字串長度:"+s1.length()+"\n"+s1);

System.out.println("s1.toUpperCase()="+s1.toUpperCase());

System.out.println("s1.substring(6)="+s1.substring(6));

System.out.println("s1.startsWith(He)="+s1.startsWith("He"));

System.out.println("s1.charAt(6)="+s1.charAt(6));

System.out.println("s1.concat( Android!)="+s1.concat(" Android!"));

System.out.println("s1字串長度:"+s1.length()+"\n"+s1);

StringBuilder s2=new StringBuilder(s1);

System.out.println("s2字串長度:"+s2.length()+"\n"+s2);

System.out.println("s2.append( CCNA!)="+s2.append(" CCNA!"));

System.out.println("s2.insert(6, Android )="+s2.insert(6, "Android "));

System.out.println("s2.replace(20, 24, WORD)="+s2.replace(20, 24, "WORD"));

System.out.println("s2.delete(20, 25)="+s2.delete(20, 25));

System.out.println("s2字串長度:"+s2.length()+"\n"+s2);

System.out.println("c1.getClass()="+c1.getClass());

System.out.println("c1.toString()="+c1.toString());

System.out.println("c2.toString()="+c2.toString());

System.out.println(12_345.05);

}

}