java中String陣列和List的互相轉化 List<String> strsToList1= Arrays.asList(strs);
阿新 • • 發佈:2022-04-07
java中String陣列和List的互相轉化
1.List轉String陣列
方法一:
//先準備一個List List<String> testList=new ArrayList<>(); testList.add("a"); testList.add("b"); testList.add("c"); //List轉String String[] strs1=testList.toArray(new String[testList.size()]); for(String s:strs1){ System.out.println(s); }
方法二:
//先準備一個List List<String> testList=new ArrayList<>(); testList.add("a"); testList.add("b"); testList.add("c"); //List轉String String[] strs2 = new String[testList.size()]; for(int i=0;i<testList.size();i++){ strs2[i]=testList.get(i); } for(String s:strs2){ System.out.println(s); }
二:String資料轉List
方法一:
//準備一個String陣列 String[] strs = {"aa","bb","cc"}; //String陣列轉List List<String> strsToList1= Arrays.asList(strs); for(String s:strsToList1){ System.out.println(s); }
方法二:
//準備一個String陣列 String[] strs = {"aa","bb","cc"}; //String陣列轉List List<String> strsToList2=new ArrayList<>(); Collections.addAll(strsToList2,strs);for(String s:strsToList2){ System.out.println(s); }
方法三:
//準備一個String陣列 String[] strs = {"aa","bb","cc"}; //String陣列轉List List<String> strsToList3=new ArrayList<>(); for(String s:strs){ strsToList3.add(s); } for(String s:strsToList3){ System.out.println(s); }
1.List轉String陣列
方法一:
//先準備一個List List<String> testList=new ArrayList<>(); testList.add("a"); testList.add("b"); testList.add("c"); //List轉String String[] strs1=testList.toArray(new String[testList.size()]); for(String s:strs1){ System.out.println(s); }
方法二:
//先準備一個List List<String> testList=new ArrayList<>(); testList.add("a"); testList.add("b"); testList.add("c"); //List轉String String[] strs2 = new String[testList.size()]; for(int i=0;i<testList.size();i++){ strs2[i]=testList.get(i); } for(String s:strs2){ System.out.println(s); }
二:String資料轉List
方法一:
//準備一個String陣列 String[] strs = {"aa","bb","cc"}; //String陣列轉List List<String> strsToList1= Arrays.asList(strs); for(String s:strsToList1){ System.out.println(s); }
方法二:
//準備一個String陣列 String[] strs = {"aa","bb","cc"}; //String陣列轉List List<String> strsToList2=new ArrayList<>(); Collections.addAll(strsToList2,strs); for(String s:strsToList2){ System.out.println(s); }
方法三:
//準備一個String陣列 String[] strs = {"aa","bb","cc"}; //String陣列轉List List<String> strsToList3=new ArrayList<>(); for(String s:strs){ strsToList3.add(s); } for(String s:strsToList3){ System.out.println(s); }
https://www.cnblogs.com/feifeicui/p/9576864.html