Java代码解析。。
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1、Java Scanner 类
https://www.runoob.com/java/java-scanner-class.html
2、Java HashMap
https://www.runoob.com/java/java-hashmap.html
3、public final class String
implements java.io.Serializable, Comparable<String>, CharSequence {
public int indexOf(int ch) {
return indexOf(ch, 0);
}
public String[] split(String regex) {
return split(regex, 0);
}
}