下列程序的运行结果是【 】。public class Test {public static void main (String args[]) {String s1＝"hello!"；System.out.println (s1.toUpperCase())；}}
下列程序的运行结果是【 】。
public class Test {
public static void main (String args[]) {
String s1＝"hello!"；
System.out.println (s1.toUpperCase())；
}}
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