import java.util.*;class SystemDemo {public static void main(String[] args) {Properties prop=System.getProperties();for (Object obj:prop.keySet() ){ String value=(String)prop.get(obj);System.out.println(obj+":"+value);}}}
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![import java.util.*;class SystemDemo {public static void main(String[] args) {Properties prop=System.getProperties();for (Object obj:prop.keySet() ){ String value=(String)prop.get(obj);System.out.println(obj+](/uploads/image/z/4110508-28-8.jpg?t=import+java.util.%2A%3Bclass+SystemDemo+%7Bpublic+static+void+main%28String%5B%5D+args%29+%7BProperties+prop%3DSystem.getProperties%28%29%3Bfor+%28Object+obj%3Aprop.keySet%28%29+%29%7B+String+value%3D%28String%29prop.get%28obj%29%3BSystem.out.println%28obj%2B%22%3A%22%2Bvalue%29%3B%7D%7D%7D)
import java.util.*;class SystemDemo {public static void main(String[] args) {Properties prop=System.getProperties();for (Object obj:prop.keySet() ){ String value=(String)prop.get(obj);System.out.println(obj+":"+value);}}}
import java.util.*;
class SystemDemo
{
public static void main(String[] args)
{
Properties prop=System.getProperties();
for (Object obj:prop.keySet() )
{
String value=(String)prop.get(obj);
System.out.println(obj+":"+value);
}
}
}
import java.util.*;class SystemDemo {public static void main(String[] args) {Properties prop=System.getProperties();for (Object obj:prop.keySet() ){ String value=(String)prop.get(obj);System.out.println(obj+":"+value);}}}
一个介词,在中文里相当于“为”“为了”“属于谁的.”
for+一段时间
eg:I am staying for a week.