1Z0-851 무료 덤프문제 온라인 액세스

Given:
1.public class TestString3 {
2.public static void main(String[] args) {
3.// insert code here
5.System.out.println(s);
6.}
7.}
Which two code fragments, inserted independently at line 3, generate the output 4247? (Choose two.)

• A.StringBuffer s = new StringBuffer("123456789");
• B.StringBuilder s = new StringBuilder("123456789");
• C.delete(0,3).delete(1,3).delete(2,5).insert(1, "24");
• D.StringBuffer s = new StringBuffer("123456789");
• E.substring(3,6).delete(1,3).insert(1, "24");
• F.String s = "123456789"; s = (s-"123").replace(1,3,"24") - "89";
• G.delete(0,3).replace(1,3,"24").delete(4,6);
• H.StringBuilder s = new StringBuilder("123456789");
• I.substring(3,6).delete(1,2).insert(1, "24");

Given:
1.interface A { public void aMethod(); }
2.interface B { public void bMethod(); }
3.interface C extends A,B { public void cMethod(); }
4.class D implements B {
5.public void bMethod(){}
6.}
7.class E extends D implements C {
8.public void aMethod(){}
9.public void bMethod(){}
10.public void cMethod(){}
11.}
What is the result?

• A.Compilation fails because of an error in line 9.
• B.Compilation fails because of an error in line 7.
• C.If you define D e = (D)(new E()), then e.bMethod() invokes the version of bMethod() defined in Line 9.
• D.Compilation fails because of an error in line 3.
• E.If you define D e = new E(), then e.bMethod() invokes the version of bMethod() defined in Line
  5.E. If you define D e = (D)(new E()), then e.bMethod() invokes the version of bMethod() defined in Line 5.

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정답:

Given:
3.class Employee {
4.String name; double baseSalary;
5.Employee(String name, double baseSalary) {
6.this.name = name;
7.this.baseSalary = baseSalary;
8.}
9.}
10.public class SalesPerson extends Employee {
11.double commission;
12.public SalesPerson(String name, double baseSalary, double commission) {
13.// insert code here
14.}
15.}
Which two code fragments, inserted independently at line 13, will compile? (Choose two.)

• A.super();
  this.commission = commission;
• B.super(name, baseSalary, commission);
• C.this.commission = commission;
  super(name, baseSalary);
• D.super(name, baseSalary);
• E.this.commission = commission;
  super();
• F.super(name, baseSalary);
  this.commission = commission;
• G.this.commission = commission;

A developer is creating a class Book, that needs to access class Paper. The Paper class is deployed in a JAR named myLib.jar. Which three, taken independently, will allow the developer to use the Paper class while compiling the Book class? (Choose three.)

• A.The JAR file is located at $JAVA_HOME/jre/classes/myLib.jar.
• B.The JAR file is located at /foo/myLib.jar and the Book class is compiled using javac -d /foo/myLib.jar Book.java
• C.The JAR file is located at $JAVA_HOME/jre/lib/ext/myLib.jar..
• D.The JAR file is located at /foo/myLib.jar and the Book class is compiled using javac -cp /foo/myLib.jar/Paper Book.java.
• E.The JAR file is located at /foo/myLib.jar and the Book class is compiled using javac -classpath /foo/myLib.jar Book.java
• F.The JAR file is located at /foo/myLib.jar and a classpath environment variable is set that includes /foo/myLib.jar/Paper.class.
• G.The JAR file is located at /foo/myLib.jar and a classpath environment variable is set that includes /foo/myLib.jar.