JavaSD3选择题答案集。

简介：
1. Which method is fundamentally required within every Java application? (a) main (b) paint (c) begin (d) init 2. Which of the following operators is utilized for string concatenation in the Java programming language? (a) + (b) ^ (c) & (d) ++ 3. Regarding the utilization of an asterisk (*) within a Java import statement, which of the following statements accurately reflects its characteristics? I. Its usage does not introduce any performance overhead during runtime. II. It facilitates importing multiple packages with a single concise statement. III. It enables importing numerous classes simultaneously through a single import declaration. (a) Only statements I and III are correct. (b) Only statement III is correct. (c) Only statement I is correct. (d) Statements I, II, and III are all accurate. 4. A key distinction between the `print` and `println` methods belonging to the `java.io.PrintWriter` class lies in their respective handling of output formatting; specifically, print inserts a newline character at the beginning of its output, whereas println appends a newline character to the conclusion of its output stream.. (a) print inserts a new line at the beginning of its output, but println does not insert one at the end.(b) println appends a new line to the end of its output, but print does not.(c) println inserts a new line at the beginning of its output, but print does not.(d) print appends a new line to the end of its output, but println does not insert one at the beginning.. 5. When executing the provided Java program segment: int x = 5; int y = 2; System.out.println(x + y); //This operation proceeds sequentially, lets examine System.out.println(x + y + “1”); what will be displayed as output? (a) 7 (b) 5 2 (c) 5+2(d) 52 6. What constitutes an appropriate approach for managing potential errors or irregularities encountered during input processing within Java programs? (a) By implementing exception handlers designed to address these issues directly.(b) By employing while loops strategically positioned to safeguard against invalid input data.(c) By leveraging the `FileFilter` class to effectively filter out substandard input data streams.(d) By consistently incorporating the `throws` clause within each method header whenever file input/output operations are performed.. 7. Within the context of Java exception handling, all exception classes ultimately derive from which fundamental class? (a) `java.lang.Throwable` (b) `java.lang.Error` (c) `java.io.IOException` (d)`java.lang.RuntimeException`