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Java 8: Find frequency of each character in String

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This java program demonstrate how to find frequency of each char in java
public class Java8 {
public static void main(String[] args) {
String str="This is a test";
.mapToObj(c - (char) c)
}
}
public class Java8 {
public static void main(String[] args) {
String str="This is a test";
.mapToObj(c - (char) c)
}
}