java判断字符串是否包含字母 java判断字符串里是否包含

java 判断字符串是否包含子串的方法

方法一：

String str1 = "nihaoksdoksad ";
String str2 = "ok ";
int total = 0;
for (String tmp = str1; tmp != null&&tmp.length()> =str2.length();){
if(tmp.indexOf(str2) == 0){
total ++;
}
tmp = tmp.substring(1);
}
System.out.println(str1+ "中含有 "+total+ "个 "+str2);

方法二：

String str1 = "nihaokokosdokosad ";
String str2 = "oko ";
int total = 0;
for (String tmp = str1; tmp != null&&tmp.length()> =str2.length();){
if(tmp.indexOf(str2) == 0){
total ++;
tmp = tmp.substring(str2.length());
}else{
tmp = tmp.substring(1);
}
}
System.out.println(str1+ "中含有 "+total+ "个 "+str2);

方法三：

String str1 = "nihaoksdoksad ";
char []c=str1.toCharArray();
int total=0;
for(int i=0;i 
if(c[i]== 'o '&&c[i+1]== 'k ')
total++;
System.out.println(str1+ "中含有 "+total+ "个ok ");