java中如何去除字符串数组中的空值

Question

我从数据库中取得一个字符串数组中含有空值，如何做判断，去掉呢。改字符串的形式大概如下：String data[] ={"14:22","15:12","13:44","",""};里面的空值如何去掉呢，如果是用List的集合去复制这个数组的话，代码应该怎么写？

Answer 1

数组长度是不可变的。要去除空值。需要手动设置成null ,复制到集合的话 用 循环赋值就可以了。然后把不需要的 空值的那个元素 remove();就可以了。

Answer 2

String data[] ={"14:22","15:12","13:44","",""};
    String st="";
    List<String> strlist=Lists.newArrayList();
    for (String strings : data) {
     strlist.add(strings);
 }
    for (String strs : strlist) {
     if(!strs.equals("")){
        st+=strs+",";
     }
 }
    System.out.println(st.substring(0, st.length()-1));
/*
利用for循环比对字符，if(!strs.equals(""))如果数组中的字符非空执行拼接字符串，比对连接后的字符串就是去掉空值的字符串。


*/

Answer 3

String []data={"14:22","15:12","13:44","",""};
List<String> list=new ArrayList<String>();
for(int i=0;i<data.length&&data.length>0;i++){
if(data[i]==null||"".equals(data[i].trim().toString())){
continue;
}else{
list.add(data[i]);
} }
String []newArray=new String[list.size()];
for(int i=0;i<newArray.length;i++){
newArray[i]=list.get(i);
}
System.out.println("除去空值的新数组就是："+newArray);
System.out.println("除去空值的List为："+list);

Answer 4

public static void main(String[] args) {
String data[] ={"14:22","15:12","13:44","",""};
String st="";
List<String> strlist=Lists.newArrayList();
for (String strings : data) {
strlist.add(strings);
}
for (String strs : strlist) {
if(!strs.equals("")){
st+=strs+",";
}
}
System.out.println(st.substring(0, st.length()-1));

}
运行结果：14:22,15:12,13:44本回答被网友采纳

Answer 5

public class Test1 {
public static void main(String[] args) {
String data[] ={"14:22","15:12","13:44","",""};
List<String> list = new ArrayList<String>();
for(int i=0;i<data.length;i++){
if(!data[i].equals("")){
list.add(data[i]);
System.out.println(list.get(i));
}
}
}
}

Answer 6

String data[] ={"14:22","15:12","13:44","",""};
    String st="";
    List<String> strlist=Lists.newArrayList();
    for (String strings : data) {
     strlist.add(strings);
 }
    for (String strs : strlist) {
     if(!strs.equals("")){
        st+=strs+",";
     }
 }
    System.out.println(st.substring(0, st.length()-1));
/*
利用for循环比对字符，if(!strs.equals(""))如果数组中的字符非空执行拼接字符串，比对连接后的字符串就是去掉空值的字符串。


*/

Answer 7

String []data={"14:22","15:12","13:44","",""};
List<String> list=new ArrayList<String>();
for(int i=0;i<data.length&&data.length>0;i++){
if(data[i]==null||"".equals(data[i].trim().toString())){
continue;
}else{
list.add(data[i]);
} }
String []newArray=new String[list.size()];
for(int i=0;i<newArray.length;i++){
newArray[i]=list.get(i);
}
System.out.println("除去空值的新数组就是："+newArray);
System.out.println("除去空值的List为："+list);

Answer 8

public static void main(String[] args) {
String data[] ={"14:22","15:12","13:44","",""};
String st="";
List<String> strlist=Lists.newArrayList();
for (String strings : data) {
strlist.add(strings);
}
for (String strs : strlist) {
if(!strs.equals("")){
st+=strs+",";
}
}
System.out.println(st.substring(0, st.length()-1));

}
运行结果：14:22,15:12,13:44本回答被网友采纳

Answer 9

public class Test1 {
public static void main(String[] args) {
String data[] ={"14:22","15:12","13:44","",""};
List<String> list = new ArrayList<String>();
for(int i=0;i<data.length;i++){
if(!data[i].equals("")){
list.add(data[i]);
System.out.println(list.get(i));
}
}
}
}