1Z0-811 Primitives, Strings and Operators — All Questions With Answers

Refer to the exhibit.

String str = "Hello";
if (str instanceof String) {
    System.out.println("Yes");
} else {
    System.out.println("No");
}

public class Test {
    public static void main(String[] args) {
        String s1 = "Java";
        String s2 = new String("Java");
        String s3 = "Java";
        System.out.println(s1 == s2);
        System.out.println(s1.equals(s2));
        System.out.println(s1 == s3);
    }
}

Refer to the exhibit.
public class Test {
    public static void main(String[] args) {
        int a = 10;
        int b = 20;
        boolean result = a > b ? a < b : a == b;
        System.out.println(result);
    }
}

Refer to the exhibit.

public class Test {
    public static void main(String[] args) {
        int x = 10;
        int y = x++ + ++x;
        System.out.println(y);
    }
}

Refer to the exhibit.
public class OperatorTest {
    public static void main(String[] args) {
        int x = 3;
        int y = ++x * x++;
        System.out.println(x + "," + y);
    }
}

public class Test {
    public static void main(String[] args) {
        int a = 3;
        int b = 5;
        int c = a * b + 2;
        System.out.println(c);
    }
}

public class StringTest {
    public static void main(String[] args) {
        String s = "Hello";
        s.concat(" World");
        System.out.println(s);
    }
}

public class BooleanCheck {
    public static void main(String[] args) {
        boolean a = true;
        boolean b = false;
        boolean c = a || b && !a;
        System.out.println(c);
    }
}

String str1 = "Java";
String str2 = new String("Java");
System.out.println(str1 == str2);

int x = 5;
int y = 0;
int z = x / y;
System.out.println(z);

String s1 = "Hello";
String s2 = "Hello";
System.out.println(s1 == s2);

Refer to the exhibit.
javac Test.java
Test.java:3: error: incompatible types: possible lossy conversion from int to byte
        byte b = 200;
                 ^
1 error

Refer to the exhibit.
public class Test {
    public static void main(String[] args) {
        String s1 = new String("Java");
        String s2 = "Java";
        System.out.println(s1 == s2);
    }
}
Output: false

Refer to the exhibit.
int x = 10;
int y = 20;
int z = x + y * 2;
System.out.println(z);

int a = 10;
int b = 5;
int c = a++ + --b * 2;
System.out.println(c);