字串,字元陣列,整型陣列,List之間的轉換應用
阿新 • • 發佈:2019-02-06
1、字串——>字元陣列:
public class Zhuanhuan {
public static void main(String []ags){
String string="fgdshfgdf";
char []c=string.toCharArray();
for(char c1:c){
System.out.println(c1);
}
}
}
2、字元陣列——>字串:
public class Zhuanhuan { public static void main(String []ags){ /* String string="fgdshfgdf"; char []c=string.toCharArray(); for(char c1:c){ System.out.println(c1); }*/ char []c={'s','d','f','g'}; StringBuffer string=new StringBuffer(); for(char c1:c){ string.append(c1); } System.out.println(string); } }
3、List——>字串:
ArrayList<String> list=new ArrayList<String>(); list.add("fsdfdf"); list.add("jfklgf"); StringBuffer stringBuffer=new StringBuffer(); for(String s:list){ stringBuffer.append(s); } System.out.println(stringBuffer);
4、List——>(字串/字元/整型)陣列
ArrayList<String> list=new ArrayList<String>();
list.add("fsdfdf");
list.add("jfklgf");
String []strings=new String[list.size()];
strings=list.toArray(strings);
for(String s:strings)
System.out.println(s);
5、陣列排序和List排序:
Integer []a={1,5,3,6,2,6,9}; List<Integer> list= Arrays.asList(a); Arrays.sort(a); Collections.sort(list); for(int i:a){ System.out.println(i); } System.out.println(); for(int i:list){ System.out.println(i); }
6、直接輸出陣列:
Arrays.toString(arr);
7、陣列變為List:
List list=Array.asList(arr);