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本節(jié)課程代碼＋注釋

在課后作業(yè)中，在生成字符的集合時有參考其它慕課同學(xué)的寫法，借鑒了一個字符類型集合的字符添加方法，并靈活使用了參數(shù)列表，佩服。

貼出我的代碼，有機會讓別的童鞋看看，換位想一下，有機會一起交流。

package?com.imooc.season3.CollectionDemo;

import?java.util.ArrayList;
import?java.util.Collections;
import?java.util.List;
import?java.util.Random;
import?java.util.Scanner;
import?java.util.stream.IntStream;

/*
?*?運用Collections.sort(List?list)對集合中的元素進行排序
?*?public?class?Collections?extends?Object
?*?This?class?consists?exclusively?of?static?methods?that?operate?on?or?return?collections.?
?*?①對Integer類的list集進行排序
?*?----10個隨機整數(shù)，打印出排序前和排序后
?*?
?*?②對String類的list集進行排序
?*?----人手輸入3個字符串，并打印出排序前和排序后
?*?
?*?③作業(yè)，存儲隨機生成的String類的list集并對其進行排序
?*?----創(chuàng)建List<String>?str集合后，往其添加十條隨機字符串
?*?----每條字符串的長度控制為10以內(nèi)的隨機整數(shù)
?*?----每條字符串都是隨機生成的字符，字符可重復(fù)
?*?----但字符串不可重復(fù)
?*/

public?class?CollectionsDemo?{
?????
	public?void?IntCollection(){
	List<Integer>?intList?=?new?ArrayList<Integer>();
	Integer?tmpInt?;
	
	for(int?i=0;i<10;i++){
		do{
			Random?randomInt?=new?Random();?
			//An?instance?of?this?class?is?used?to?generate?a?stream?of?pseudorandom?numbers.
			tmpInt?=?randomInt.nextInt(100);
			//返回0-100以內(nèi)的整數(shù)
			System.out.println("將要添加整數(shù)"+tmpInt);
		????}while(intList.contains(tmpInt));
	????????intList.add(tmpInt);
	?????????}
	
	System.out.println("?");
	System.out.println("========排序前===========");
	for(Integer?tmpNo?:intList){
	System.out.println(tmpNo);	
	}
	
	System.out.println("?");
	System.out.println("========排序后===========");
	Collections.sort(intList);
	//void方法，Sorts?the?specified?list?into?ascending?order,?according?to?the?natural?ordering?of?its?elements.
	for(Integer?tmpNo?:intList){
	System.out.println(tmpNo);	}
	
	}
	
	public?void?StrCollection(){
		List<String>?strList?=?new?ArrayList<String>();
		System.out.println("?");
		System.out.println("========請輸入3個字符串===========");
//		?quantity?=input.nextInt();}?//Scans?the?next?token?of?the?input?as?an?int.
		for(int?i=1;i<=3;i++){
			System.out.println("請輸入第"+i+"個字符串");
			Scanner?input?=?new?Scanner(System.in);
			?String?inputStr?=input.next();
			if(strList.contains(inputStr)){?//如果為true
				System.out.println("字符串"+inputStr+"已存在，請重新輸入");
				strList.remove(inputStr);
				i--;
			}
			?strList.add(inputStr);
		}
		
		System.out.println("?");
		System.out.println("========排序前===========");
		for(String?tmpName?:strList){
		System.out.println(tmpName);	
		}
		
		System.out.println("?");
		System.out.println("========排序后===========");
		Collections.sort(strList);
		//void返回值的方法，Sorts?the?specified?list?into?ascending?order,?according?to?the?natural?ordering?of?its?elements.
		for(String?tmpName?:strList){
		System.out.println(tmpName);	}
		
	}

		//生成字符表,借鑒一位慕課網(wǎng)童鞋的，對字符方面玩得真的很溜！！佩服
	public?void?generateAlphabeta(List<Character>?list,char?st,char?ed){
		?for(char?c=?st;c<=ed;c++){
		?list.add(c);
		}
		?}	
		
	public?void?StrCollectionDemo(){
		List<String>?stringList?=?new?ArrayList<String>();
		List<Character>?subList?=?new?ArrayList<Character>();
			???????
		generateAlphabeta(subList,?'a',?'z');//將a-z加入字符表
		generateAlphabeta(subList,?'A',?'Z');//將A-Z加入字符表
		generateAlphabeta(subList,?'0',?'9');//將0-9加入字符表
		Random?number?=?new?Random();
		int?length;?????????????????????
		for(int?i=0;i<10;i++){
		do{
		length?=number.nextInt(11);//規(guī)定1-10?的長度，返回一個1-10的其中一個數(shù)
		}while(length?==0);
		
		String?tmpStr?="";
		for(int?y=0;y<length;y++){
		Random?index?=new?Random();
		tmpStr?=tmpStr+subList.get(index.nextInt(subList.size()));
		}
		stringList.add(tmpStr);
		System.out.println("添加"+stringList.get(i)+"元素成功");
		
		}
		
		System.out.println("?");
		System.out.println("========排序前===========");
		for(String?tmpString?:stringList){
		System.out.println(tmpString);	
		}
		
		System.out.println("?");
		System.out.println("========排序后===========");
		Collections.sort(stringList);
		//void返回值的方法，Sorts?the?specified?list?into?ascending?order,?according?to?the?natural?ordering?of?its?elements.
		for(String?tmpString??:stringList){
		System.out.println(tmpString?);	}
		
	}
	
	public?static?void?main(String[]?args)?{
	//?TODO?Auto-generated?method?stub
			CollectionsDemo?t01?=new?CollectionsDemo(?);
		t01.IntCollection();
		//t01.StrCollection();
	????t01.StrCollectionDemo();
	}

}




/*
?*?運用Collections.sort(List?list)對集合中的元素進行排序
?*?public?class?Collections?extends?Object
?*?This?class?consists?exclusively?of?static?methods?that?operate?on?or?return?collections.?
?*?①對Integer類的list集進行排序
?*?----10個隨機整數(shù)，打印出排序前和排序后
?*?
?*?②對String類的list集進行排序
?*?----人手輸入3個字符串，并打印出排序前和排序后
?*?
?*?③作業(yè)，存儲隨機生成的String類的list集并對其進行排序
?*?----創(chuàng)建List<String>?str集合后，往其添加十條隨機字符串
?*?----每條字符串的長度控制為10以內(nèi)的隨機整數(shù)
?*?----每條字符串都是隨機生成的字符，字符可重復(fù)
?*?----但字符串不可重復(fù)
?*/

public?class?CollectionsDemo?{
?????
	public?void?IntCollection(){
	List<Integer>?intList?=?new?ArrayList<Integer>();
	Integer?tmpInt?;
	
	for(int?i=0;i<10;i++){
		do{
			Random?randomInt?=new?Random();?
			//An?instance?of?this?class?is?used?to?generate?a?stream?of?pseudorandom?numbers.
			tmpInt?=?randomInt.nextInt(100);
			//返回0-100以內(nèi)的整數(shù)
			System.out.println("將要添加整數(shù)"+tmpInt);
		????}while(intList.contains(tmpInt));
	????????intList.add(tmpInt);
	?????????}
	
	System.out.println("?");
	System.out.println("========排序前===========");
	for(Integer?tmpNo?:intList){
	System.out.println(tmpNo);	
	}
	
	System.out.println("?");
	System.out.println("========排序后===========");
	Collections.sort(intList);
	//void方法，Sorts?the?specified?list?into?ascending?order,?according?to?the?natural?ordering?of?its?elements.
	for(Integer?tmpNo?:intList){
	System.out.println(tmpNo);	}
	
	}
	
	public?void?StrCollection(){
		List<String>?strList?=?new?ArrayList<String>();
		System.out.println("?");
		System.out.println("========請輸入3個字符串===========");
//		?quantity?=input.nextInt();}?//Scans?the?next?token?of?the?input?as?an?int.
		for(int?i=1;i<=3;i++){
			System.out.println("請輸入第"+i+"個字符串");
			Scanner?input?=?new?Scanner(System.in);
			?String?inputStr?=input.next();
			if(strList.contains(inputStr)){?//如果為true
				System.out.println("字符串"+inputStr+"已存在，請重新輸入");
				strList.remove(inputStr);
				i--;
			}
			?strList.add(inputStr);
		}
		
		System.out.println("?");
		System.out.println("========排序前===========");
		for(String?tmpName?:strList){
		System.out.println(tmpName);	
		}
		
		System.out.println("?");
		System.out.println("========排序后===========");
		Collections.sort(strList);
		//void返回值的方法，Sorts?the?specified?list?into?ascending?order,?according?to?the?natural?ordering?of?its?elements.
		for(String?tmpName?:strList){
		System.out.println(tmpName);	}
		
	}

		//生成字符表,借鑒一位慕課網(wǎng)童鞋的，對字符方面玩得真的很溜?。∨宸?	public?void?generateAlphabeta(List<Character>?list,char?st,char?ed){
		?for(char?c=?st;c<=ed;c++){
		?list.add(c);
		}
		?}	
		
	public?void?StrCollectionDemo(){
		List<String>?stringList?=?new?ArrayList<String>();
		List<Character>?subList?=?new?ArrayList<Character>();
			???????
		generateAlphabeta(subList,?'a',?'z');//將a-z加入字符表
		generateAlphabeta(subList,?'A',?'Z');//將A-Z加入字符表
		generateAlphabeta(subList,?'0',?'9');//將0-9加入字符表
		Random?number?=?new?Random();
		int?length;?????????????????????
		for(int?i=0;i<10;i++){
		do{
		length?=number.nextInt(11);//規(guī)定1-10?的長度，返回一個1-10的其中一個數(shù)
		}while(length?==0);
		
		String?tmpStr?="";
		for(int?y=0;y<length;y++){
		Random?index?=new?Random();
		tmpStr?=tmpStr+subList.get(index.nextInt(subList.size()));
		}
		stringList.add(tmpStr);
		System.out.println("添加"+stringList.get(i)+"元素成功");
		
		}
		
		System.out.println("?");
		System.out.println("========排序前===========");
		for(String?tmpString?:stringList){
		System.out.println(tmpString);	
		}
		
		System.out.println("?");
		System.out.println("========排序后===========");
		Collections.sort(stringList);
		//void返回值的方法，Sorts?the?specified?list?into?ascending?order,?according?to?the?natural?ordering?of?its?elements.
		for(String?tmpString??:stringList){
		System.out.println(tmpString?);	}
		
	}
	
	public?static?void?main(String[]?args)?{
	//?TODO?Auto-generated?method?stub
			CollectionsDemo?t01?=new?CollectionsDemo(?);
		t01.IntCollection();
		//t01.StrCollection();
	????t01.StrCollectionDemo();
	}

}



////生成字符表
//public?void?generatorAlphabeta(List<Character>?list,char?st,char?ed){
//??????for(char?c=?st;c<=ed;c++){
//??????????list.add(c);
//??????}
//??}
//???
//public?void?testSort2(){
//??????List<String>?stringList?=?new?ArrayList<String>();
//??????List<Character>?subList?=?new?ArrayList<Character>();
//???????
//??????generatorAlphabeta(subList,?'a',?'z');//將a-z加入字符表
//??????generatorAlphabeta(subList,?'A',?'Z');//將A-Z加入字符表
//??????generatorAlphabeta(subList,?'0',?'9');//將0-9加入字符表


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1 回答

import?java.util.stream.IntStream;

請問這是干嘛用的

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