java 字符串加%,Java向字符串添加字符

I have two strings in a java program, which I want to mix in a certain way to form two new strings. To do this I have to pick up some constituent chars from each string and add them to form the new strings. I have a code like this(this.eka and this.toka are the original strings):

String muutettu1 = new String();

String muutettu2 = new String();

muutettu1 += this.toka.charAt(0) + this.toka.charAt(1) + this.eka.substring(2);

muutettu2 += this.eka.charAt(0) + this.eka.charAt(1) + this.toka.substring(2);

System.out.println(muutettu1 + " " + muutettu2);

I'm getting numbers for the .charAt(x) parts, so how do I convert the chars to string?

解决方案

Just use always use substring() instead of charAt()

muutettu1 += toka.substring(0,1) + toka.substring(1,2) + eka.substring(2);

muutettu2 += eka.substring(0,1) + eka.substring(1,2) + toka.substring(2);

e.g. when the position arent isn't fixed values but variables do

muutettu1 += toka.substring(x,x+1) + toka.substring(y,y+1) + eka.substring(z);

muutettu2 += eka.substring(x,x+1) + eka.substring(y,y+1) + toka.substring(z);

where x,y,z are the variables holding the positions from where to extract