Java snippets for reference

JavaSnippets.java

// Two ways to "for each / foreach"
String letters = "abcdefghijklmnopqrstuvwxyz";
char[] letterArr = letters.toCharArray();

for (int i = 0; i < letterArr.length; i++) {
    System.out.println(letterArr[i]);
}
// Above and below are the same in result
for (char c : letterArr) {
    System.out.println(c);
}
// ===== ===== ===== ===== ===== ===== //
// Ternary (short-form if/else)
if (x == null) {
    y = 0;
} else {
    y = x;
}
// Above and below are the same in result
y = ((x == null) ? 0 : x);

//region Java Records
// Shallowly immutable class
class LabeledStringList {
    private final String label;
    private final List<String> list;

    public LabeledStringList(final String label, final List<String> list) {
        this.label = label;
        this.list = list;
    }

    public String label() {
        return label;
    }

    public List<String> list() {
        return list;
    }

    @Override
    public boolean equals(Object o) {
        if (!(o instanceof LabeledStringList that)) return false;
        return Objects.equals(label, that.label) && Objects.equals(list, that.list);
    }

    @Override
    public int hashCode() {
        return Objects.hash(label, list);
    }

    @Override
    public String toString() {
        return String.format(
            "%s[label=%s, list=%s]",
            getClass().getSimpleName(),
            label,
            list
        );
    }
}

// As a record
record LabeledStringList(String label, List<String> list) {
}
//endregion