Java基础----Properties

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package com.cug.datastream;import java.util.Properties;import java.util.Set;public class PropertyDemo {public static void main(String[] args) {Properties p = new Properties();p.put("zhu", 1);p.put("jia", 2);p.put("shuai", 3);Set<Object> keys = p.keySet();for(Object key: keys){Object value = p.get(key);System.out.println(key+"----"+value);}}}/* * class Properties extends Hashtable<Object,Object> */

package com.cug.datastream;import java.util.Properties;import java.util.Set;public class PropertiesDemo01 {public static void main(String[] args) {Properties p = new Properties();p.setProperty("zhu", "2");p.setProperty("jia", "3");p.setProperty("shuai", "5");Set<String> keys = p.stringPropertyNames();for(String key: keys){Object value = p.get(key);System.out.println(key+":"+value);}}}

package com.cug.datastream;import java.io.FileReader;import java.io.FileWriter;import java.io.IOException;import java.io.Reader;import java.io.Writer;import java.util.Properties;import java.util.Set;public class PropertiesDemo02 {public static void main(String[] args) throws IOException {writer();reader();}private static void writer() throws IOException{Properties p = new Properties();p.setProperty("zhu", "1");p.setProperty("shaui", "3");p.setProperty("jia", "2");Writer w = new FileWriter("a.txt");p.store(w, "HelloWorld");w.close();}private static void reader() throws IOException{Properties p = new Properties();Reader r = new FileReader("a.txt");p.load(r);//Set<String> keys = p.stringPropertyNames();//for(String key: keys){//Object value = p.get(key);//System.out.println(key+":"+value);//}System.out.println(p);r.close();}}

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