String类的切割字符串功能
package MyString;
public class StringDemo2 {
public static void main(String[] args) {
String s1 = "helloworld";
String s2 = " helloworld ";
String s3 = " hello world ";
System.out.println("---"+s1+"---");
System.out.println("---"+s1.trim()+"---");
System.out.println("---"+s2+"---");
System.out.println("---"+s2.trim()+"---");
System.out.println("---"+s3+"---");
System.out.println("---"+s3.trim()+"---");
System.out.println("-------------------");
String s4 = "aa,bb,cc";
String[] strArray = s4.split(",");
for(int x=0; x<strArray.length; x++) {
System.out.println(strArray[x]);
}
}
}
将数组数据拼接诚一个字符串练习
package MyString;
public class StringQiege {
public static void main(String[] args) {
int[] arr = {
1,2,3};
String s=arrToString(arr);
System.out.println("s:"+s);
}
public static String arrToString(int[] arr){
String s="";
s+="[";
for (int i=0;i<arr.length;i++){
if (i==arr.length-1){
s+=arr[i];
}else{
s+=arr[i];
s+=",";
}
}
s+="]";
return s;
}
}