删除java中字符串的最后一部分

Question

String Y="part1 part2 part3",X="part1";

boolean foundMatch = false;
while(!foundMatch) {
    foundMatch = Y.equals(X);
    if(foundMatch) {
        break;
    }
    else {
        Y = useSplitToRemoveLastPart(Y);
        if(Y.equals("")) {
            break;
        }
    }

// useSplitToRemoveLastPart()的实现

private static String useSplitToRemoveLastPart(String y) {

  //What goes here .. It should chop the last part of the string..
return null;

 }

谁能帮忙......

Answer 1

如果您希望删除part3并提供所有单词由空格分隔

String str ="part1 part2 part3";

String result = str.substring(0,str.lastIndexOf(" "));