多项选择题
NumberFormat nf= NumberFormat.getInstance();
nf.setMaximumFractionDigits(4);
nf.setMinimumFractionDigits(2);
String a = nf.format(3.1415926);
String b = nf.format(2);
Which two are true about the result if the default locale is Locale.US?()
A. The value of b is 2.
B. The value of a is 3.14.
C. The value of b is 2.00.
D. The value of a is 3.141.
E. The value of a is 3.1415.
F. The value of a is 3.1416.
G. The value of b is 2.0000.
相关考题
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单项选择题
10. public class Foo implements java.io.Serializable { 11. private int x; 12. public int getX() { return x; } 12.publicFoo(int x){this.x=x; } 13. private void writeObject( ObjectOutputStream s) 14. throws IOException { 15. // insert code here 16. } 17. } Which code fragment, inserted at line 15, will allow Foo objects to be correctly serialized and deserialized?()
A. s.writeInt(x);
B. s.serialize(x);
C. s.writeObject(x);
D. s.defaultWriteObject(); -
单项选择题
Assuming that the serializeBanana2() and the deserializeBanana2() methods will correctly use Java serialization and given: import java.io.*; class Food {Food() { System.out.print(”1”); } } class Fruit extends Food implements Serializable { Fruit() { System.out.print(”2”); } } public class Banana2 extends Fruit { int size = 42; public static void main(String [] args) { Banana2 b = new Banana2(); b.serializeBanana2(b); // assume correct serialization b = b.deserializeBanana2(b); // assume correct System.out.println(” restored “+ b.size + “ “); } // more Banana2 methods } What is the result?()
A. Compilation fails.
B. 1 restored 42
C. 12 restored 42
D. 121 restored 42
E. 1212 restored 42
F. An exception is thrown at runtime. -
单项选择题
Assuming that the serializeBanana() and the deserializeBanana() methods will correctly use Java serialization and given: import java.io.*; class Food implemertts Serializable {int good = 3;} class Fruit externds Food {int juice = 5;} public class Banana extends Fruit { int yellow = 4; public static void main(String [] args) { Banana b = new Banana(); Banana b2 = new Banana(); b.serializeBanana(b); // assume correct serialization b2 = b.deserializeBanana(); // assume correct System.out.println(”restore “+b2.yellow+ b2.juice+b2.good); } // more Banana methods go here } What is the result?()
A. restore 400
B. restore 403
C. restore 453
D. Compilation fails.
E. An exception is thrown at runtime.
