Given: int[] myArray=newint[] {1, 2,3,4, 5}; What allows you to create a list from this array?() A、 List myList = myArray.asList();B、 List myList = Arrays.asList(myArray);C、 List myList = new ArrayList(myArray);D、 List myList = Collections.fromArray(myArray);
Given: int[] myArray=newint[] {1, 2,3,4, 5}; What allows you to create a list from this array?()
- A、 List myList = myArray.asList();
- B、 List myList = Arrays.asList(myArray);
- C、 List myList = new ArrayList(myArray);
- D、 List myList = Collections.fromArray(myArray);
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public class X implements Runnable { private int x; private int y; public static void main(String [] args) { X that = new X(); (new Thread( that )).start(); (new Thread( that )).start(); } public void run() { for (;;) { synchronized (this) { x++; y++; } System.out.println(Thread.currentThread().getName() + “x = “ + x + “, y = “ + y); } } } What is the result?() A、 Compilation fails.B、 The program prints pairs of values for x and y that might not always be the same on the same line (for example, “x = 2, y = 1”).C、 The program prints pairs of values for x and y that are always the same on the same line (for example, “x = 1, y = 1”). In addition, each value appears only once (for example, “x = 1, y = 1” followed by “x = 2, y = 2”). The thread name at the start of the line shows that both threads are executing concurrently.D、 The program prints pairs of values for x and y that are always the same on the same line (for example, “x = 1, y = 1”). In addition, each value appears only once (for example, “x = 1, y = 1” followed by “x = 2, y = 2”). The thread name at the start of the line shows that only a single thread is actually executing.
Given the Tag: Assuming the tag referenced by my Tags: get Advice uses the Classic event model, which is true?()A、 The do After Body method is called.B、 The doEnd Tag method is NOT called.C、 The type attribute may be specified in the TLDD、 The do Start Tag Method must always return SKIP_BODY.E、 The TLD for this tag must NOT include a tag.
public class Person { private name; public Person(String name) { this.name = name; } public boolean equals(Object o) { if( !o instanceof Person ) return false; Person p = (Person) o; return p.name.equals(this.name); } } Which is true?() A、 Compilation fails because the hashCode method is not overridden.B、 A HashSet could contain multiple Person objects with the same name.C、 All Person objects will have the same hash code because the hashCode method is not overridden.D、 If a HashSet contains more than one Person object with name=”Fred”, then removing another person, also with name=”Fred”, will remove them all.
对于变量的初始化,以下几种方法中错误的是() A、int a; for (int i=0;i《12;i++) a=i;B、int a; if (true) a=7;C、int a; int b=a;D、int a=0;E、int a; a=0;
public class Car { private int wheelCount; private String vin; public Car(String vin) { this.vin = vin; this.wheelCount = 4; } public String drive() { return “zoom-zoom”; } public String getInfo() { return “VIN: “+ vin + “wheels: “+ wheelCount; } } And: public class MeGo extends Car { public MeGo(String vin) { this.wheelCount = 3; } } What two must the programmer do to correct the compilation errors?()A、 insert a call to this() in the Car constructorB、 insert a call to this() in the MeGo constructorC、 insert a call to super() in the MeGo constructorD、 insert a call to super(vin) in the MeGo constructorE、 change the wheelCount variable in Car to protectedF、 change line 3 in the MeGo class to super.wheelCount = 3;
引用变量作为函数参数时,值是否可以变化() A、变化,因为引用变量中存储的仅是对象的指针B、变化,因为引用变量不是以值传递的形式传给函数内部的C、不变,因为引用变量同样是以值传递的形式传的D、不变,因为引用变量在传递时会先复制一份对象
Which of these are keywords in Java?() A、defaultB、NULLC、StringD、throwsE、long