多项选择题
A.public int sum(int a, int b) { return a + b; }
B.public int sum(long a, long b) { return 0; }
C.abstract int sum();
D.private long sum(long a, long b) { return a + b; }
E.public long sum(long a, int b) { return a + b; }
多项选择题 Whichstatementsconcerningcastingandconversionaretrue?()
多项选择题 Given the following code, which statements concerning the objects referenced through the member variables i, j and k are true, given that any thread may call the methods a, b and c at any time? () class Counter { int v = 0; synchronized void inc() { v++; } synchronized void dec() { v--; } } public class Q7ed5 { Counter i; Counter j; Counter k; public synchronized void a() { i.inc(); System.out.println("a"); i.dec(); } public synchronized void b() { i.inc(); j.inc(); k.inc(); System.out.println("b"); i.dec(); j.dec(); k.dec(); } public void c() { k.inc(); System.out.println("c"); k.dec(); } }
单项选择题 What will be written to the standard output when the following program is run?() public class Q03e4 { public static void main(String args[]) { String space = " "; String composite = space + "hello" + space + space; composite.concat("world"); String trimmed = composite.trim(); System.out.println(trimmed.length()); } }