以下代码的运行结果是哪一项。public class J_Intern{public static void main(String args[ ]){String s1 = "123456";String s2 = "123456";String s3 = "123" + "456";String a0 = "123";String s4 = a0 + "456";String s5 = new String("123456");String s6 = s5.intern( );System.out.println("s2" + ((s2==s1) ? "==" : "!=") +"s1");System.out.println("s3" + ((s3==s1) ? "==" : "!=") +"s1");System.out.println("s4" + ((s4==s1) ? "==" : "!=") +"s1");System.out.println("s5" + ((s5==s1) ? "==" : "!=") +"s1");System.out.println("s6" + ((s6==s1) ? "==" : "!=") +"s1");}}

A. s2=s1s3=s1s4!=s1s5!=s1s6=s1
B. s2=s1s3=s1s4=s1s5!=s1s6=s1
C. s2=s1s3=s1s4!=s1s5!=s1s6!=s1
D. s2!=s1s3=s1s4!=s1s5!=s1s6=s1