java return indexOf问题

来源：百度知道 编辑：UC知道 时间：2024/09/20 02:39:20
public class String_Example {

//public static int getIndex (String str1 ){
//System.out.println("Go");
//return str1.indexOf("aab");
public static int testFindStr(String str,String str2){
return str.indexOf(str2);
//System.out.println("str.indexOf(\"is\") = " + str.indexOf("is"));
}

// }
public static void main(String args[]){
// String str1 = "aabbccddabcdaaa";
//String str2 = "abc";
// String_Example.getIndex(str1 );
String str = "This is a String object!";
String str2 = "String";
System.out.println("str的值:" +str);
String_Example.testFindStr(str,str2);
}
}为何没有返回值呢，谢谢

public static void main(String[] args) {
String str = "This is a String object!";
String str2 = "String";

System.out.println(str.indexOf(str2));
}

public static void main(String args[]){
// String str1 = "aabbccddabcdaaa";
//String str2 = "abc";
// String_Example.getIndex(str1 );
String str = "This is a String object!";
String str2 = "String";
System.out.println("str的值:" +String_Example.testFindStr(str,str2));

}
}