?import java.util.Arrays;import java.util.Calendar;import java.util.Date;? ?interface Iqianqian{ ? ?void methodone(); void methodFour(); void methodTwo(); void methodThree(); void methodfour();?}public ? class Helloqianqian { ?public static void main(String[] args) { ?Iqianqian qq= new tender(); ?System.out.println("功能1"+" "); ?qq.methodone(); ?System.out.println("功能2"+" "); ?qq.methodTwo(); ?System.out.println("功能3"+" "); ?qq.methodThree(); ?System.out.println("功能4"+" "); ?qq.methodfour();}public ? class tender implements Iqianqian{ public void methodOne() {? ? ? ? Calendar Q = Calendar.getInstance();? ? ? ? Date date = Q.getTime();? ? ? ? Long time = Q.getTimeInMillis();? ? ? ? int year = Q.get(Calendar.YEAR);? ? ? ? int month = Q.get(Calendar.MONTH) + 1;? ? ? ? int day = Q.get(Calendar.DAY_OF_MONTH);? ? ? ? int hour = Q.get(Calendar.HOUR_OF_DAY);? ? ? ? int minute = Q.get(Calendar.MINUTE);? ? ? ? int second = Q.get(Calendar.SECOND);? ? ? ? System.out.println("您好北京時(shí)間；" + date);? ? ? ? System.out.println("小Q報(bào)時(shí)；" + year + "年" + month + "月" + day + " ?" + hour + "；" + minute + "；" + second);? ? ? ? System.out.println("毫秒數(shù)； " + time);? ? }?? ? @Override? ? public void methodTwo() {? ? ? ? String Q = " Hello lan qian is a good girl ?";? ? ? ? System.out.println("字符串長(zhǎng)度：" + Q.length());? ? ? ? System.out.println("轉(zhuǎn)換為大寫：" + Q.toUpperCase());? ? ? ? System.out.println("子串為：" + Q.substring(6, 30));? ? ? ? String q1 = Q.replace("good", "beatuiful");? ? ? ? System.out.println("替換為：" + Q.replace("good", "beatuiful"));? ? ? ? System.out.println("刪除字符串兩邊多余的空格：" + Q.trim());? ? ? ? System.out.println("qian的位置: " + Q.indexOf("qian"));? ? ? ? String[] arr = Q.split(" ");? ? ? ? System.out.println("把空格拆成數(shù)組 ； " + Arrays.toString(arr));? ? ? ? byte[] q2 = Q.getBytes();? ? ? ? System.out.print("轉(zhuǎn)換為字節(jié)數(shù)數(shù)組： ");? ? ? ? for (int i = 0; i < q2.length; i++) {? ? ? ? ? ? System.out.print(q2[i] + " ");? ? ? ? }? ? }?? ? @Override? ? public void methodThree() {? ? ? ? int[] Q = new int[20];? ? ? ? for (int i = 1; i < 20; i++) {? ? ? ? ? ? Q[i] = (int) (Math.random() * 100+1);? ? ? ? ? ? Arrays.sort(Q);? ? ? ? ? ? System.out.println("排序后的數(shù);" +Q[i] + " ");? ? ? ? }? ? }?? ? @Override? ? public void methodFour() {? ? ? ? int score = 110;? ? ? ? Integer englishscore = new Integer(score);? ? ? ? String str = "108";? ? ? ? int mathscore = Integer.valueOf(str);? ? ? ? double chinesescore = englishscore.doubleValue();? ? ? ? int sum = (int) (mathscore + score + chinesescore);? ? ? ? int averge = (sum / 3);? ? ? ? System.out.println("三門課總成績(jī)；" + sum);? ? ? ? System.out.println("三門課平均成績(jī)；" + averge);? ? }?? ? double doubleValue() {? ? ? ? return 0;? ? }?? ? int valueOf(String str) {? ? ? ? return 0 ;? ? } @Override public void methodone() { // TODO Auto-generated method stub } @Override public void methodfour() { // TODO Auto-generated method stub }? ?? }}