调用以下类D和E的main() 方法的输出结果为？class D { public static void main(String[] args) { String s1 = new String("hello"); String s2 = new String("hello"); if (s1.equals(s2)) System.out.println("equal"); else System.out.println("not equal"); }} class E { public static void main(String[] args) { StringBuffer sb1 = new StringBuffer("hello"); StringBuffer sb2 = new StringBuffer("hello"); if (sb1.equals(sb2)) System.out.println("equal"); else System.out.println("not equal"); }} A: D: equal; E: equal B: D: not equal; E: not equal C: D: equal; E: not equal D: D: not equal; E: equal

___, I would buy the red coat not the green one. A: To be equal to other things B: Other things being equal C: Other things to be equal D: Were other things to be equal

When the total revenue is equal to total cost, the are said to be at the break-even point.

假设有String a="A"；char b＝'A'; char c=65，下面选项中正确的是( )。 A: if(a== {Systeouprint("Equal")} B: if(c== {Systeouprint("Equal")} C: if(a== {Systeouprint("Equal")} D: if(c== {Systeouprint("Equal")}

Consumption of the total life-cycle effort in software maintenance is（ ） that in software development． A: less than B: larger than C: equal or less than D: equal or larger than